The 3 Other Precious Gemstones In The Raw

Recently I wrote a blog about raw rubies before they are cut, polished and turned into jewelry. Today I’m posting images of the 3 other precious gemstones in the raw. When we visualize gemstones, mostly we see them as the sparklers they become after craftsmen and jewelers get their hands on them like the above Harry Winston diamond ring. Not how them start or grow in nature, but how they are finished, right? So let's look at a few images of gemstones as they are found in nature.

I. Diamonds are a single element. Formula: C. A diamond is an allotrope of the element carbon. Its structure is a rigid three-dimensional lattice where each carbon atom is bonded to four other carbon atoms in a tetrahedral arrangement. A diamond’s atoms are arranged in a crystal structure called a diamond cubic. The gemstone rates a 10 on Mohs Hardness Scale. BTW: Graphite, charcoal, and diamond are all allotropes of the element carbon.

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The Aga Khan Emerald brooch and the Chalk Emerald ring

II. Emeralds - are beryls, a mineral. Its formula, Be3Al2(SiO3)6, is colored green by trace amounts of chromium or sometimes vanadium. On Mohs Hardness Scale emeralds rate an 8. They were formed under the most violent of geologic conditions, which is why less than 1% of the world’s emeralds are eye clean. Unlike diamonds, inclusions and surface breaking fissures called  jardins are common and accepted in emerads. 

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The Swedish royal family's Leuchtenberg Sapphire tiara and an unheated Kashmir 9.38 sapphire ring sold by Christie’s

III. Sapphires - are a variety of the mineral corundum. Its formula, α-Al2O3 consists of the elements aluminum oxide with trace amounts of iron, titanium, cobalt, lead, chromium, vanadium, magnesium, boron, and silicon. Sapphires register a 9 on Mohs Hardness scale. Blue is the most in demand color. When sapphires are yellow, orange, purple, pink, or green they are called fancy sapphires. When corundrms are red, they are rubies, not sapphires.

Gemstones take millions of years for the Earth to produce, or nowadays they can be grown in a lab, but it takes the artistry of human hands to turn these majestic crystals, beryls, and corundums into gorgeous pieces of jewelry. The next time you see a gemstone think of its journey and how many hands went into crafting it into a thing of beauty.

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Admiring Rubies In The Raw

Today I want to feature high quality rubies in their natural state. I’d be trilled to find such a precious red crystal before it was cut and turned into jewelry. I’m not sure I’d want to cut or polish it. Previously I’ve written about rubies detailing their properties and value, which I’ll link below.👇The main purpose of this blog is to fawn over uncut rubies!

In the jewelry world, rubies are one of the rarest and most coveted gemstones. The red corundum derives its color from traces of chromium. All other colors of gem-quality corundum are classified as sapphires, including pink corundum. Gemologists and jewelers expect a medium to medium-dark red color tone for a gemstone to be considered a genuine ruby. Corundums of lighter coloration are pink sapphires. A ruby's exclusive red color can reach high levels of saturation. Due to their rarity, premium quality rubies are among the world's most expensive gemstones, selling for over $1 million per carat.

Historically, Myanmar (formerly called Burma) was the most renowned source for high-saturation with fluorescence, or "pigeon's blood," rubies. But in 2009 major deposits of high quality rubies were discovered in Mozambique to rival Myanmar rubies. Vietnam and Madagascar also grow similar high quality rubies.

Since there are few gemstone quality high saturation rubies in nature, rubies undergo more treatments than nearly all other gemstones before being turned into jewelry, greatly affecting their market value. Most commercial rubies are at least heat-treated, an accepted practice as long as it’s disclosed and reflected in its retail price. Without treatment there would be few rubies to sell.

A lovely affordable raw ruby bracelet here from an unfamiliar retailer.

Aren’t these blocks of uncut vibrant red gemstones beautiful? Especially when knowing that not all natural ruby crystals are gemstone quality. If you want to know more about gemstone quality rubies, you can click the links below.

If you found a raw ruby would you treasure it or have it cut and polished into a piece of jewelry? 

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Demantoid Versus Tsavorite Garnets

Demantoid Garnets

Tsavorite Garnets

 Photos: jupitergem.com

Did you know that Mother Earth makes 2 types of green garnets? Demantoid garnets were originally found in Russia’s Ural Mountains in 1851 and Tsavorite garnets were later discovered in East Africa in 1967.  

Demantoid - Wikipedia

A demantoid Ca3Fe2(SiO4)3 is an andradite garnet while a tsavorite Ca3Al2Si3O12 is a grossular garnet.

Tsavorite is a rich, deep green like emeralds. Its color is derived from chromium and vanadium. A yellow tint from ferric iron is more characteristic of demantoid garnets.

A demantoid garnet has a higher dispersion and refractive index than a tsavorite garnet, giving it more fire*, brilliance* or sparkle.

A tsavorite garnet is harder, registering 7 - 7.5 on Mohs Hardness Scale compared to the softer demantoid garnet at 6.5 - 7.

While both are rare mineral gemstones, high-quality demantoids (from Russia) are often considered the standard for green garnets and are highly sought after for their intense sparkle and rare horsetail inclusions. These inclusions are feathery golden threads of chrysotile that curve to resemble the tail of a horse. 

Tsavorite

Tsavorites are valued for their vibrant green hues and durability. Tsavorites are brighter and cleaner (meaning they have fewer inclusions) than emeralds.

Here’s an informative link to compare the value and desirability of all 3 green gemstones. If you covet an emerald for less money, a green garnet is worth considering.

At Tiffany and Co, I remember seeing demantoid garnets in a showcase that were yellow tinted and sparkled like crazy. Tiffany is known for its top of the line colored gemstones. Once again, we have to marvel at the spectacular beauty and versatility of Mother Nature!

 

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Lesson Time: *Gemstone brilliance is the overall white light reflection from a gemstone, contributing to its brightness and liveliness, while fire is the dispersion of white light into rainbow-colored flashes, created by the gemstone’s (especially a diamond’s) internal refraction. Both are key components of a gemstone's "sparkle," but brilliance is about the amount of white light returned, and fire is about the colorful light shows that occur. This is especially key when determining the value of diamonds. Colored gemstones sparkle far less than diamonds. Color is their most important factor.

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Pearls Courtesy of the Qatar Museums

Made in 1800, I couldn’t find any history on it. Who made it? Who owned it? Can anyone solve the mystery?

In 2018 The Museums of Qatar put together an exhibition called “Pearls: Treasures From the Seas and the Rivers.” that opened at the State Historical Museum in Moscow as a cultural exchange. It featured a collection of over 100 pieces of pearl jewelry and artifacts from the Arabian Gulf, Europe and Asia. The traveling exhibit showcased the history and cultural significance of pearls with emphasis on their role in Qatar’s history, which was once a major center for pearl diving and trade. The show highlighted pearl fishing techniques and the artistry of pearl jewelry from different cultures and eras. Online media called it "one of the finest collections of pearl jewelry ever assembled.”

I'll show you a few pieces that caught my eye. 

Above 👆is a diamond brooch centered by a cushion shaped rare pink diamond with a gorgeous drop pearl. Breathtakingly beautiful, it is mounted in gold. ©1800

A tiara designed by Koechert was made in 1913 of gold, silver, diamonds and pearls for Archduchess Marie Valerie, the youngest child of Emperor Franz Joseph and Empress Elizabeth (Sisi) of Austria.

The Rosebery tiara was designed in London by Garrard in 1878 for Hannah Rothchild upon her marriage to the Earl of Rosebery, making her Countess Rosebery. It has large diamonds and natural Pacific Ocean Pearls. 

Tiffany designed the above chrysanthemum brooch, one of several, with freshwater pearls from Mississippi in 1880.

 

The wide V-shaped broach is believed to have once belonged to Empress Maria Theresa who ruled Austria from 1740-1780. Set in gold, its 40+ natural round and pear shaped pearls come from the Persian Gulf.

The Millennium Necklace and Earrings Set was designed by Cartier in Paris in 2000. It is made of natural Pacific Ocean pearls and sizable emeralds. The center emerald was carved in 17th century India.

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Close up view of the Pearl Carpet of Baroda

Although the famed Pearl Carpet of Baroda wasn’t in the 2018 exhibit (no mention that it was), it is a centerpiece in the National Museum of Qatar's permanent collection. The opulent carpet was commissioned by Khande Rao Gaekward, the Maharaja (governor) of Baroda, in 1865. It has over 1.5 million Basra pearls, diamonds, sapphires, emeralds, and rubies. The gemstones are embroidered onto a deerskin and silk backing. The Maharaja had it made to cover the tomb of the Prophet in Medina, but then couldn’t part with it, so it stayed in his family until 2009 when it sold at auction.

Pearls are timeless and elegant! What a magnificent show for the lucky folks who saw it! The 1st brooch might be my favorite piece, if forced, forced, forced to choose, even though we don’t really wear brooches anymore. The brooch's pink diamond and pink drop pearl are flawless and gorgeous! Which one is your favorite?𓆉🐌🐚🦀

If you wish to learn more about pearls click the 1st link, below.⚪

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