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In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [80] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
The garnet family is one of the most complex in the gem world. It is not a single species, but is composed of multiple species and varieties. [54] It is the state mineral of Connecticut, [55] New York's gemstone, [56] and star garnet (garnet with rutile asterisms) is the state gemstone of Idaho. [57]
Cullinan Diamond. The Cullinan Diamond is the largest gem-quality rough diamond ever found, [2] weighing 3,106 carats (621.20 g), discovered at the Premier No.2 mine in Cullinan, South Africa, on 26 January 1905. It was named after Thomas Cullinan, the owner of the mine. In April 1905, it was put on sale in London, but despite considerable ...
US$200–350 million. The Hope Diamond is a 45.52 carats (9.104 g; 0.3211 oz) diamond that has been famed for its great size since the 18th century. Extracted in the 17th century from the Kollur Mine in Guntur, India, [1][2] the Hope Diamond is a blue diamond. Its exceptional size has revealed new information about the formation of diamonds.
Several ruby-set pieces were included in the sale, notably a ring set with an 8.24 ct gem that broke the 'price-per-carat' record for rubies (US$512,925 per carat – i.e., over US$4.2 million in total), [37] and a necklace [38] that sold for over US$3.7 million. The Liberty Bell Ruby is the largest mined ruby in the world. It was stolen in a ...
French Haute Couture Honeycomb (1950s) Another vintage jewelry piece that could be worth a lot is the French Haute Couture Honeycomb from the 1950s. This piece alone could be worth $3,000 or more ...
Gemstone. Group of precious and semiprecious stones—both uncut and faceted—including (clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or ...
Chatoyant gems. Some minerals made into gemstones may display a chatoyancy or cat's eye effect, these include: [1] Actinolite; Andalusite; Apatite; Beryl. Aquamarine;
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