Monday, February 23, 2009

Smithsonian Collection

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Some of the world's most spectacular diamonds and other gems are located in the National Gem Collection in the Museum of Natural History in Smithsonian Collection in Washington, D.C. In the collection are diamonds known to almost everyone, such as the Hope Diamond, as well as other large diamonds and other precious gems and jewelry.

In the National Gem Collection are examples of spectacular minerals and crystals, as well gemstones and jewelry. You can see a beautiful purple quartz amethyst crystal, or the mineral azurite, which is a bright blue copper compound mineral.

You can also see a huge green beryl crystal. Beryls are the mineral family that includes emeralds, aquamarines, heliodor and morganite. It's almost as exciting to see the raw crystal, as it is to see the finished product when it's been cut and polished.

Some of the finished pieces in the Smithsonian Collection include the crown Napoleon used for the second Empress, Marie Louise. It originally was made of 700 carats in diamonds and 79 emeralds. The emeralds have been replaced with Persian turquoise cabochons.

You can also see the 182-carat Star of Bombay star sapphire that was given to Mary Pickford by Douglas Fairbanks and a brilliantly colored black opal. Black opals are the most valuable of the opal family of gems.

There are also extraordinary examples of quartz crystals, including a 7,000 faceted clear quartz egg! Part of the Smithsonian's collection includes pieces of jade and turquoise used in other cultures.

This includes a collection of Zuni Indian turquoise jewelry and jade lanterns carved from nephrite for the Chinese emperor Chi'en Lung in 1750. A more modern piece is the Dragon Vase, carved from a rare piece of lavender jade.

But of course, the most dazzling items in the collection are the individual gemstones and jewelry that have been owned by royalty through the centuries.

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Monday, February 16, 2009

Spanish Inquisition Necklace

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One doesn't normally associate beautiful jewelry with the time of the Spanish Inquisition. But in the Smithsonian Institution's collection of gems, there is an exquisite necklace of diamonds and emeralds.

It is a spectacular double row of diamonds and emeralds ending in a chandelier of emeralds. There is unfortunately very little information about the provenance of this necklace. The large diamonds and Columbian emeralds were most likely cut in India in the 17th century. This would make them one of the earliest examples of cut gemstones in the Smithsonian's Collection.

There are really only legends surrounding this necklace. They indicate that it was worn at times by Spanish and French royalty. In the early 20th century, it was purchased by the Maharajah of Indore, whose son sold the necklace in 1947 to Harry Winston. Winston subsequently sold the necklace to Mrs. Cora Hubbard Williams of Pittsburgh. She bequeathed it to the Smithsonian in 1972.

Emeralds are a form of crystal known as beryls. Beryls are normally clear crystals, but when infused with chromium or vanadium, they attain various gradations of green. The purest green are the rarest emeralds and many people actually prefer an emerald that has a blue-green tint.

Before the 16th century, the only known emerald deposits were in Cleopatra's Egyptian mines. But after emeralds were discovered in Columbia, those became the 'gold standard' in emeralds. Columbian emeralds have been discovered by archaeologists among artifacts of such tribes as the Inca, Maya, Aztec, Toltec and the lesser-known Chibcha Indians.

Emeralds are among the rarest of gemstones and can be more expensive per carat than even the finest diamonds! They are a hard mineral, with a Moh's hardness scale of 7 or 8 (compared to a diamond's 10). While most emeralds are found in Africa, Russia and Africa, there have been discoveries of emerald deposits in North Carolina!

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Monday, February 9, 2009

Sri Lanka

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One of the world's most beautiful and exotic islands, Sri Lanka, (formerly Ceylon) lies just below the southern tip of India. This pear-shaped bit of tropical paradise, about the size of Sicily, is a tourist's delight offering British teahouses, rubber plantations, and gem mines.

Marco Polo wrote of his visit in 1292: "I want you to understand that the island of Ceylon is, for its size, the finest island in the world, and from its streams comes rubies, sapphires, topazes, amethyst and garnet." Little has changed since Marco Polo's time except that Sri Lanka faces overpopulation and a faltering economy.

Its gemstones, however, seem to occur in endless supply. Known as the "Jewel Box of the Indian Ocean," Sri Lanka, like possibly no other locality on earth, has yielded precious stones and fine gems in a great profusion of gem species and varieties. The island was known in the ancient world as Taprobane (copper colored in Greek).

Native Veddahs, bathing in smooth flowing streams, noticed colored pebbles scattered in sandy bottoms. It was not until 500 B.C. that conquering Buddhists from northern India also discovered gems in the rivers and began to set rough stones into crude jewelry.

They bartered stones with traders from abroad and eventually the treasures found their way to the marketplaces of Asia and Europe. Ancient Greek and Chinese historians referred to the beautiful gems of Ceylon, and King Solomon reportedly wooed the Queen of Sheba with Ceylonese precious stones.

The crown jewels of royalty all over the world contain extraordinary spinels, sapphires, and zircons mined from Sri Lanka streams. The Imperial Treasury of the Soviet Union houses a 400-carat red spinel of great beauty which was once given to Catherine the Great.

The British Imperial Crown features a giant oval-cut spinel (previously supposed to be a ruby), known as the "Black Prince." Crowns in the Green Vaults of Dresden are covered with sapphires from Sri Lanka.

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Wednesday, February 4, 2009

Victoria Transvaal Diamond

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The Victoria-Transvaal is a 67.89-carat, brownish-yellow pear shaped stone. It was cut from a 240-carat crystal that was found in the Transvaal, South Africa. The first cutting produced a 75-carat 116-facet stone that measured 1 x 13/8 inches; a recutting retained the same length and width, but reduced the depth to better proportions, making it more brilliant.

The diamond has been featured in several Hollywood films, including a Tarzan episode from 1952 titled Tarzan's Savage Fury, and in leading exhibitions in the United States and Canada.

The necklace was designed by Baumgold Brothers, Inc, and consists of a yellow gold chain with 66 round brilliant-cut diamonds, fringed with ten drop motifs, each set with two marquise-cut diamonds, a pear-shaped diamond, and a small round brilliant-cut diamond (the total weight of the 106 diamonds is about 45 carats).

The configuration of these stones makes them look like small angels! The necklace was donated by Leonard and Victoria Wilkinson in 1977 to the Smithsonian Institute, Washington D.C.

Other colored diamonds in the Smithsonian Collection include the 8.30-carat Shepard Diamond. This stone is from South Africa, and was acquired by the Smithsonian Museum in exchange for a collection of small diamonds that had been seized as smuggled goods by the United States Customs Service. The diamond is named for the Smithsonian employee who helped facilitate the transaction.

An extremely rare red diamond resides at the Smithsonian as well. This is the De Young Red, a 5.03-carat, brilliant cut red diamond. The main kite-shaped facets on the crown are divided in two, giving the stone more brilliance than a standard round brilliant cut.

The stone is not pure red but has a slight brown hue, which makes it appear like a fine red garnet and indeed, it was once purchased as such at an estate sale.

It is the third largest red diamond in the world, after the Moussaieff Red (5.11 carats) and the Red Diamond (5.05 carats).

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