BMJ Blog

How Diamonds Are Used (Beyond The World of Jewelry)

Posted on February 07, 2019 by Mary Hood | 0 Comments

How Diamonds Are Used (Beyond The World of Jewelry)

Although diamonds are beloved for their starring role in many a fine jewelry item, they have a lesser-known yet critical role to play in many industrial and non-jewelry pursuits. We often forget that diamonds are the hardest naturally occurring substance—each carbon atom in a diamond is surrounded by four other carbon atoms connected by strong, covalent bonds. Thanks to this structure, diamonds are the only stone with a hardness of 10 on the Mohs Scale. Because diamonds are so resistant to being scratched, they can come in handy for a variety of uses.

In fact, only a small portion of diamonds are used for jewelry purposes. These gem-quality diamonds are graded for color and clarity. Diamonds that don’t rank highly in these respects may find themselves in an industrial setting, serving to grind, cut, drill, and polish other durable materials. In other cases, industrial diamonds are sometimes used to protect sensitive materials from heat and abrasion—or even deliver medication. Industrial diamonds are so versatile and useful that the demand for them exceeds their supply. For this reason, lab-grown diamonds (rather than diamonds mined from the earth), help meet the high demand.

The following are the primary uses for industrial diamonds:

How Diamonds Are Used (Beyond The World of Jewelry)

Diamond drill bit.

Abrasive. Most industrial diamonds are used as abrasives. To become abrasives, diamonds are crushed into micron-sized abrasive particles that are then embedded into saw blades, drill bits, and grinding wheels. In fact, diamond abrasives are used to cut and polish other diamonds!

How Diamonds Are Used (Beyond The World of Jewelry)

Polishing a diamond.

Cancer treatment. Diamond particles have been used to treat certain cancers. After absorbing chemotherapy drugs, the particles are used to deliver the medication to the right area of the body while protecting the medication from the body’s defense system. Moreover, the particles help the treatment stay in the cancerous cells for longer, rendering it more effective. 

Diamond windows. Diamonds can be turned into thin membranes to cover openings on lasers, X-ray machines, and vacuum chambers. Diamond windows are useful because they resist heat and abrasion.

Diamond speaker domes. These are used to enhance the performance of high-quality speakers. A thin, diamond dome will vibrate rapidly when exposed to sound vibrations; this vibration does not degrade the quality of the sound, however.

Heat sinks. Diamonds can absorb and transmit excess heat. In fact, they have the highest thermal conductivity of any element. When used as heat sinks, they conduct heat away from heat-sensitive parts of high-performance microelectronics. 

Low-friction micro-bearings. Diamonds can be used as bearings in tiny mechanical devices where durability and abrasion resistance is needed.   

How Diamonds Are Used (Beyond The World of Jewelry)

Diamonds serve as micro-bearings in small mechanical devices.

Water-resistant parts. To form a water-resistant coating, diamonds are vaporized, and the vapor is applied as a coating to a surface.

Were you aware that diamonds had so many fascinating uses?
You may also be interested in: Trend Watch: What Is a Raw Diamond?



Photos: Wikimedia Commons, John Englart via Flickr, Max Pixel

Posted in diamond cutting, diamond uses, Diamonds

How Are Pearls Formed?

Posted on January 10, 2019 by Mary Hood | 0 Comments

Contrary to popular lore, pearls aren’t necessarily formed when a grain of sand enters an oyster. That’s likely a myth. Rather, pearls form when a tiny organism (probably a parasite) enters a shell-producing mollusk (a group that includes oysters, mussels, clams, marine snails, and abalone).

As a defensive mechanism, the mollusk forms a protective crystalline substance around the irritant. This protective substance is called “nacre.” Nacre is composed of calcium carbonate and protein, and it is both lighter and stronger than concrete. (It’s also the same substance that forms the inside of the mollusk’s shell.) Nacre gives pearls their gem-like luster.

How Are Pearls Formed?

Barbara Michelle Jacobs Green with Envy Pearl Ring

Natural pearls of real value occur very rarely, however. In fact, a pearl of value occurs in less than one of every 10,000 pearl oysters. Moreover, it can take at least three years for an oyster to coat an irritant with enough nacre to form a gem-quality pearl. Low-quality pearls are often the result of a pearl being “rushed out” of the oyster after less than a year. With these pearls, the coating of nacre is too thin to create adequate luster.


What Are the Different Kinds of Pearls? | Barbara Michelle Jacobs Jewelry

Barbara Michelle Jacobs Morganite Gemstone and Pearl Ring

Cultured pearls help meet the high demand for real pearls. In the case of cultured pearls, a bead or piece of shell called mother of pearl is surgically inserted into the oyster. The inserted piece is also sometimes called the “nuclei.” The mollusk reacts to the nuclei the same way it would to a natural parasite by layering it with nacre, thereby forming a pearl.

Although saltwater pearls have historically been considered more valuable, thanks to their natural roundness and luster, freshwater pearls, which were once usually irregularly shaped, may now look more like their saltwater counterparts due to advances in pearl farming technology. See more about the different types of real pearls.

What Are the Different Kinds of Pearls? | Barbara Michelle Jacobs Jewelry

Barbara Michelle Jacobs Vine and Pearl Gold Ring

Finally, there are imitation pearls, which are usually made by dipping a glass bead in a solution made of fish scales. Because nacre has a distinct grit, it’s usually possible to tell the difference between a real and imitation pearl by running your teeth over them. An imitation pearl will feel smooth while a real pearl, natural or cultured, will feel gritty.


You may also be interested in: The Meaning of Pearls
Photos: Barbara Michelle Jacobs Jewelry

Posted in gem facts, pearl jewelry, pearls

How to Stack Bracelets

Posted on December 13, 2018 by Mary Hood | 1 Comment

 How to Stack Bracelets | Barbara Michelle Jacobs Blog

Barbara Michelle Jacobs Gold Twig Bangles

Interestingly, minimalist fashion and intricate layering are en vogue at the same time. While there’s a lot to be said for minimalism, there’s something about layering pieces that brings out the inner girl-in-mom’s-jewelry-box—it’s playful, whimsical, and joyful. Stacking or layering jewelry—whether that’s necklaces, rings, or bracelets—allows the wearer to customize her look and even artfully combine multiple styles.

Layering jewelry can be an art, and like any art, understanding a few fundamentals can take your craft to the next level. Although throwing on just any combination of pieces can lead to a cool look, there are a some loose guidelines that will have you stacking jewelry—in this case, bracelets—like a pro stylist.

How to Stack Bracelets | Barbara Michelle Jacobs Blog 

How to Stack Bracelets

While necklaces may require more precision layering, you can get away with a lot when it comes to stacking bracelets, so don’t be afraid to go big! That being said, keep in mind the length and style of your shirt sleeves. The more elaborate (lacy, patterned, etc.) your sleeve, the easier you want to go with the bracelets. You don’t want your shirt sleeve to be competing for space or attention with your bracelets.

 How to Stack Bracelets | Barbara Michelle Jacobs Blog

Start simple. Begin with 2-4 pieces. 

Start with a staple—like your wristwatch or a bracelet you wear almost every day.

How to Stack Bracelets | Barbara Michelle Jacobs Blog

Experiment with one arm rather than tackling both at once. 

When layering bracelets, keep in mind that mixing textures, thickness, materials, and metals will yield a more interesting and personalized stack. Also, don’t be afraid to mix fine jewelry with everyday jewelry—like semi-precious stones or even a friendship bracelet. In fact, avoid anything too matchy-matchy.

How to Stack Bracelets | Barbara Michelle Jacobs Blog 

Keep the rest of your look fairly simple. Skip stacking rings and layering necklaces, and allow your wrist(s) to make your style statement.

Keep your nails neat. Stacked bracelets (and rings) will draw attention to your hands, so nix the chipped polish if you’re planning to layer jewelry around your hands.

How to Stack Bracelets | Barbara Michelle Jacobs Blog 

Be mindful of where you’ll be wearing your stack. Any place (like the office) in which layered (i.e. noisy) bracelets may annoy those around you probably isn’t the place to sport your stack. 

How to Stack Bracelets | Barbara Michelle Jacobs Blog

Ideas for Bracelet Combinations

Feminine Luxe:

Gold statement watch + delicate gold chain + charm bracelet with toggle closure + rose quartz beaded bracelet.

Colorful & Fun:

Multicolored bracelet(s) + wrap bracelet + beaded bracelet + bulky statement piece.

Rocker Style:

Studded cuff + silver chain + rhodium-plated (black) bangle or chain.

Boho Chic:

Beaded bracelet(s) with tassel + metal cuff + patterned piece + friendship bracelet.

Metal Lover:

Rose gold cuff + silver bangle + simple gold chain.

Are you a fan of stacking bracelets? What are your favorite combinations?

You may also like: 

Trend Watch: Animal-Inspired Jewelry

A Brief History of the Charm Bracelet

Macabre Jewelry: Modern Poison Rings by Wendy Brandes


Photos: Barbara Michelle Jacobs Jewelry, Luvvi9, WhoWhatWear, Personalized from Me to You, Atuces de filles, BuyerSelect, Natalie Young

Posted in bracelets, fashion trends, jewelry trends, layered necklaces, stacked bracelets

The Fascinating History of Diamond Marketing

Posted on November 02, 2018 by Mary Hood | 0 Comments

Have you ever wondered how diamonds became the creme de la creme of gemstones? Yes, diamonds are the hardest mineral (with a Mohs score of 10), and they do have the unique ability to reflect light in the colors of the rainbow when properly cut (a quality known as fire). But it’s hard to deny that other stones are just as captivating, especially when we factor in different tastes. Plus, diamonds aren’t even particularly rare (in fact, they’re one of the most common gems on earth).

The Fascinating History of Diamond Marketing | Barbara Michelle Jacobs Blog

Yet, somehow, contemporary culture has maintained its adoration of the diamond. Since most of us can remember, diamonds have been the symbol of status, wealth, glamour, and even romantic love. While there are plenty of reasons to value diamonds, our generations-old fixation with the stone may actually be partially rooted in some clever marketing.

It all began in the 19th century. Thanks to what writer Edward Jay Epstein refers to as “the diamond invention,” marketers in the diamond industry were able to perpetuate the idea that diamonds are rare and incredibly valuable. This campaign, however, was born precisely because recently discovered large diamond mines threatened the profitable balance of supply and demand. Until 1870, diamonds were primarily found in a few riverbeds and in the jungles of Brazil, but a major discovery of diamonds near the Orange River in South Africa rendered diamonds more common—and therefore potentially less able to fetch a steep price. 

In response, diamond investors combined their interests in De Beers Consolidated Mines, Ltd. in 1888. Although De Beers went by several names in different countries, its mission was singular—control the diamond industry and foster the illusion that diamonds were still rare and exclusive. To this end, the monopoly relied on a marketing scheme connecting diamonds to sentiment. In 1947, diamonds were cemented as a symbol of eternal love and high status through the famous “A Diamond Is Forever” ad campaign

The Fascinating History of Diamond Marketing | Barbara Michelle Jacobs Blog

The heavy marketing behind diamonds doesn’t have to ruin the stone for anyone, however. Regardless of diamonds’ ubiquity, they can still feel incredibly special once they’re in a perfect setting—and especially if they’re a gift from a loved one. And let’s not forget the allure of vintage diamonds, which usually have an interesting backstory. Also, there’s plenty of opportunities to be a positive force in the diamond industry. By supporting artisanal diamond miners and working with your jeweler to ensure your diamonds are conflict-free, you’ll be contributing to a market that promotes fair treatment of workers. Learn more here.

Canadian diamonds are conflict-free.

Are you a diamond lover? What’s your favorite diamond piece?

More about diamonds: 

Trend Watch: What Is a Raw Diamond?

What Is a Lab-Grown Diamond?

Diamonds vs. White Sapphires

Photos: Wikimedia Commons, De Beers, Barbara Michelle Jacobs

Posted in diamond rings, engagement, engagement ring, engagement rings

Silver Legends: Silver as Weapon against Vampires and Werewolves

Posted on October 11, 2018 by Mary Hood | 0 Comments

Silver Legends: Silver as Weapon against Vampires and Werewolves | Barbara Michelle Jacobs Blog

From the Twilight series to True Blood, there’s no absence of vampire lore (and entertainment) in the 21st century. Likewise, there are individuals who believe in the existence of vampires and are compelled to hunt these mysterious creatures of the darkness—some vampire hunters have even been arrested for weapons violations!

There are a few vampire-slaying weapons, however, that won’t attract the attention of law enforcement but may make you feel a bit safer while traipsing through a cemetery at night--or so the lore goes. Garlic, of course, has been trusted for centuries as a potent anti-vampire substance. And then there’s also silver, which has been woven into more recent vampire stories. Those unfamiliar with contemporary legends of vampires may wonder—Why silver? Why not gold or platinum or all precious metals?

Silver Legends: Silver as Weapon against Vampires and Werewolves | Barbara Michelle Jacobs Blog

A search for the origin of the belief in silver as a vampire antidote will reveal that the history of the idea is as murky as the underworld itself. Between "ancient texts" and internet lore, there's no shortage of incomplete, dubious, and fanciful stories to keep you entertained. Here's one to make your head spin: 

Judas Iscariot as the “Original Vampire” (?)

In the New Testament, Judas Iscariot betrays Christ, resulting in Christ’s crucifixion. In return for his betrayal, Judas is given thirty silver pieces. He soon after regrets his decision, but his efforts to repent bring him no peace:

Then Judas, who had betrayed him, when he saw that he was condemned, repented himself, and brought again the thirty pieces of silver to the chief priests and elders, saying, I have sinned in that I have betrayed the innocent blood. And they said, What is that to us? see thou to that. And he cast down the pieces of silver in the temple, and departed, and went and hanged himself. (Matthew 27:3-5)

This is where the New Testament leaves us as far as Judas’s story is concerned. According to one blogger with supposed access to a rare and ancient text, the narrative was revisited in 843 when a Catholic monk by the name of Aed penned the Book of Agulan, in which he recorded Judas’s fate after this scene in Matthew. The blogger suspects that Aed was recording threads of a story he’d heard shared around the community.

In this version of the story, God punishes Judas by restoring his life, cursing him to wander the earth, in fear of sunlight, without the comfort of death until the end of time. (Some sources debate the matter of light sensitivity.) As further punishment, God only permits Judas to drink human blood, forbidding him water and wine.

Silver as Punishment. As a final punishment in this narrative, God makes Judas silver-intolerant, a painful reminder of his transgression. In this story, Judas fathers many offspring—and all of them are fated to walk in the darkness as “Creatures of the Night,” feeding on human blood. Proponents of the Judas-as-original-vampire theory believe that the Iscariot clan spanned modern-day Serbia, Bulgaria, and Romania. (No references to this story appear before 2012, however.)

(Funnily enough, pieces of this legend sound a lot like the plot of the movie Dracula 2000. Coincidence?)  

It’s generally acknowledged in contemporary vampire lore (internet and TV series) that silver both burns and temporarily paralyzes vampires, inhibiting them from removing the silver from their bodies.

Despite the hold that the Judas-as-vampire story seems to have on the some vampire internet "experts"-- and the belief that silver harms vampires--a look at older literature and events reveals that silver may be a recent adaptation. In fact, it may actually have its origins in legends of werewolves.

Silver Saves the French Countryside

In the 18th century, Gévaudan, an area in south-central France, witnessed the devastating attacks of what many believed to be a werewolf. From 1764 to 1767, the beast reportedly roamed the countryside, attacking, killing, and sometimes eating unsuspecting victims. One report notes that out of 210 attacks, 113 resulted in death.

Silver Legends: Silver as Weapon against Vampires and Werewolves | Barbara Michelle Jacobs Blog

Of course, what some believed was a werewolf could have been a pack of ordinary but hungry wolves. Either way, a hunting team was organized to kill the Beast of Gévaudan.  Jean Chastel, a local hunter, was believed to kill the large wolf with a blessed silver bullet. Thus, the idea of silver-as-werewolf-killer was born.

Bram Stoker's Dracula--Not Harmed by Silver? 

Dracula (1897) by Bram Stoker is arguably the most famous vampire novel and is considered a seminal text in the horror genre. It doesn't look like silver plays a big role in the story, however. The only references to silver (as a metal) are to a silver lamp that Dracula, himself, holds in his hands:

"Within, stood a tall old man, clean shaven save for a long white moustache, and clad in black from head to foot, without a single speck of colour about him anywhere. He held in his hand an antique silver lamp, in which the flame burned without chimney or globe of any kind, throwing long quivering shadows as it flickered in the draught of the open door...He bowed in a courtly way as he replied:—“I am Dracula; and I bid you welcome...As he was speaking, he put the lamp on a bracket on the wall"

Silver crops up at least once more in the story in the form of the silver crucifix that Dr. Van Helsing, an occult specialist, gives to Jonathan Harker (Dracula's prisoner) before they go to hunt down Dracula. The power of the crucifix seems to be only in the fact that it is a crucifix, however.

Could this mean that silver as a vampire antidote was simply confused with werewolf legends? Has silver now become a go-to vampire weapon for screenwriters and contemporary horror writers? What are your thoughts? 

You may also be interested in: 


Photos: Aniko’s BlogDracula Movie, Wikimedia Commons

Posted in folklore, silver, silver legends, silver lore

A Brief History of Antique Miniature Portrait Jewelry

Posted on September 06, 2018 by Mary Hood | 0 Comments

Although mourning jewelry is typically associated with Victorian fashion, mourning jewelry dates back to at least the 15th century when miniature portraits (which were often worn as jewelry) gained popularity among European monarchy. In fact, the miniature portraits famously featured in Victorian mourning and sentimental jewelry is the product of centuries of development.
A Brief History of Antique Portrait Jewelry | BMJ Blog

Miniature portraits on display at the National Museum in Warsaw.

The Origin of Miniature Portrait Jewelry

Mourning jewelry expert Hayden Peters argues that miniature portraits have their roots in the introduction of the printing press. “Miniature” stems from the Latin miniare, or “to color with red lead.” During the 15th century (and for some time before), hand-printed books often featured red capital letters (these books are also known as illuminated manuscripts).

By the 1460s, however, these handmade books faced competition from books created with the printing press. Although there continued to be hand-illustrated books, some illustrators turned their attention to creating miniature portraits.

By the 1520s, miniature portraits were popular items in French and English courts. Jean Clouet in France and Lucas Horenbout in England were two early notable miniaturists, creating miniature portraits for jewelry that could be worn around the neck or simply held in the palm of one’s hand. At a certain point, miniature portraits were used to adorn snuff boxes as well.

A Brief History of Miniature Portrait Jewelry | BMJ Blog

Portrait of a man against a background of flames by Nicholas Hollard, c. 1600.

Miniature Portrait Symbolism

From roughly 1580 to 1635, miniature portraits were fashionable gifts among society’s elite. They could be given unframed to a loved one, allowing the recipient to select their desired frame. In some areas, they were even the subject of public ceremonies. In addition to serving as memorial pieces, miniatures were of special important to those whose loved ones were required to travel or live far away. For example, a wife may have kept a miniature portrait of her husband while he was away.

Peters points out that the Humanist movement during the Renaissance may have played a role in the popularity of miniatures. Given the renewed focus on the individual (rather than the divine), it’s no wonder that people would want to carry around images of the people they held dear.

A Brief History of Miniature Portrait Jewelry | BMJ Blog

Miniature portrait of Charles I.

Miniature portraits also served as an outlet for individuals’ political loyalties. During the reign of Oliver Cromwell, some people carried around mourning portraits of Charles I to show their solidarity with the Crown.

Miniature Portrait Materials and Innovations

Miniature portraits were sometimes as small as 40mm x 30mm. Initially, they involved watercolor painted on stretched vellum. By the second half of the 17th century, most miniatures were created by painting vitreous enamel on copper, a method that was particularly popular in France. By the late 18th century, this method was mostly replaced by watercolor on ivory (ivory had become fairly affordable by this point).

A Brief History of Miniature Portrait Jewelry | BMJ Blog

Miniature mourning portrait of a young girl.

The quality of miniature portraits varied, of course, with some featuring exquisite details while others were created from classic templates and adjusted to more closely represent an individual’s features—with varying degrees of accuracy.

With the development of the daguerreotype in the mid-19th century, the popularity of miniature portraits eventually diminished in favor of photographic technology.


You may also be interested in: A Brief History of the Charm Bracelet
Witch’s Heart Jewels and Other Antique Heart Jewelry
The History of the Cufflink



Photos: Wikimedia Commons, The Art of Mourning


Posted in antique jewelry, art, memorial jewelry, mourning

How Should I Store My Jewelry If I Live In a Warm Climate?

Posted on August 09, 2018 by Mary Hood | 0 Comments

How Should I Store My Jewelry If I Live In a Warm Climate?

There are several recommendations when it comes to proper jewelry storage—don’t let pearls get scratched in your jewelry box, keep chains untangled, make sure your finest jewelry is securely locked away (and maybe even insured!)… but we rarely consider the temperature at which our jewelry is stored.

Fortunately, this isn’t really a huge concern unless you live in a particularly warm climate or a climate with wildly fluctuating temps. If you do live in a balmy zone (even if for just part of the year), however, the following are a few things to keep in mind in regards to safe jewelry storage.

If possible, always store your jewelry at room temperature. This means avoiding attic storage if your attic isn’t temperature-controlled. This is especially essential if you’re storing silver—jewelry or dining ware—as warm temps may increase the oxidation rate of silver (that is, how fast it tarnishes).  (Rest assured, however, that gold will not be affected by warm temperatures.)

In a warm climate, the temperature isn’t the only element to keep in mind. If your climate is both warm and dry, consider storing solid opals in water to prevent cracking. Opals naturally contain about 5-6% water, and the water used to store them will help prevent the opal from losing its water due to the low humidity. Simply place your opal in a piece of cotton or wool with a few drops of water and then into a zip-locked plastic bag to help retain the moisture. (Learn more about the different kinds of opals here.)

Light is another factor to consider. Gems that have been color-treated are vulnerable to damage (including color alteration) when exposed to UV light for long periods of time. Store them in an opaque box away from heat sources and direct sunlight.

Finally, think about the storage materials themselves. Heat, humidity changes, and direct sunlight can do a number to both unfinished and varnished wood and can even make plastic brittle and faded over time. Remember this if you store your jewelry in an heirloom jewelry box.

What additional tips do you have for best protecting your fine jewelry?

Learn more about caring for your jewelry here, or see how to make your own DIY wooden jewelry box.



Photo: Pexels

Posted in jewelry care, jewelry solutions, jewelry storage, jewelry tips