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History of Jewelry: May 1, 2006
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Enter your search terms. Monday, May 1, 2006. Troy weight is a system of units of mass customarily used for precious metals and gemstones. Troy ounce of a fineness of 999.9 parts per 1,000 parts, equal to 31.1034 grams. Troy weight originates from what was called the troy system of mass. Dating back to before the time of William the Conqueror, the name comes from the city of Troyes in France, an important trading city in the Middle Ages. 1 troy ounce = 31.1034768 grams. History of Jewelry: Troy Ounce.
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History of Jewelry: Dec 6, 2006
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Enter your search terms. Wednesday, December 6, 2006. Although many of the varietal names historically arose from the color of the mineral, current scientific naming schemes refer primarily to the microstructure of the mineral. Color is a secondary identifier for the cryptocrystalline minerals, although it is a primary identifier for the macrocrystalline varieties. This does not always hold true. Lechatelierite is an amorphous silica glass SiO2 which is formed by lightning strikes in quartz sand. The nam...
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History of Jewelry: Oct 22, 2006
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Enter your search terms. Sunday, October 22, 2006. Fil·i·gree (fĭl'ĭ-grē'). Delicate and intricate ornamental work made from gold, silver, or other fine twisted wire. An intricate, delicate, or fanciful ornamentation. A design resembling such ornamentation: filigrees of frosting on a cake. Filigree (formerly written filigrann or filigrane) is a jewel work of a delicate kind made with twisted threads usually of gold and silver. Some very curious filigree work was brought from Abyssinia after the capture o...
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History of Jewelry: Jan 1, 2006
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Enter your search terms. Sunday, January 1, 2006. Israel Diamonds Exports Grow By 6%. Ramat Gan - - July 5. Israel net polished diamonds export industry rose 6% from January to June 2005, according to statistics reported by the Israel Ministry of Industry, Trade and Labor's Diamond Controller, Shmuel Mordechai. Why Buy Diamonds from Israel? The Israel Diamond Exchange is the largest in the world, offering the greatest selection of diamonds under one roof. Buying in Israel is safe and convenient ̵...
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History of Jewelry: Mar 28, 2005
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Enter your search terms. Monday, March 28, 2005. The largest Diamond ever found:. Cullinan at 3,106 carats. What is the hardest natural substance on Earth? 80% of the world's diamonds are not suitable for Jewelry. Is a Diamond Indestructible? No The fact that Diamonds are a hard substance refers to their ability to withstand scratching. But that is different than toughness, which refers to the ability to withstand breaking or cleavage. How old are most diamonds which are found in nature?
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History of Jewelry: Mar 7, 2005
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Enter your search terms. Monday, March 7, 2005. Are a hard, rounded object produced by certain mollusks, primarily oysters. Pearl is valued as a gemstone and is cultivated or harvested for Jewellery. In the 1990s, Japanese pearl producers also invested in producing cultured pearls with freshwater mussels in the region of Shanghai, China, and in Fiji. Freshwater pearls are characterized by the reflection of rainbow colors in the luster. Cultured pearls are also produced using abalone. Necklaces can also b...
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History of Jewelry: Mar 9, 2005
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Enter your search terms. Wednesday, March 9, 2005. Use of pewter was common from the Middle Ages up until the various developments in glass-making during the 18th and 19th centuries. Mass production of glass products has seen glass universally replace pewter in day-to-day life. Pewter artifacts continue to be produced, mainly as decorative or specialty items. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article Pewter. Subscribe to: Posts (Atom).
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History of Jewelry: Mar 6, 2005
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Enter your search terms. Sunday, March 6, 2005. Naturally-occurring platinum and platinum-rich alloys have been known since antiquity. Although there is evidence that the metal was used in the Americas in pre-Columbian times, the first European reference to platinum appears in 1557 as a description of a mysterious metal found in Central American mines. When the Spanish first encountered the metal, they regarded it as an undesirable impurity in the silver they were mining and often discarded it.
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History of Jewelry: Jun 5, 2006
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Enter your search terms. Monday, June 5, 2006. Owing to their uranium and thorium content, some zircons may undergo metamictization. This partially disrupts the crystal structure and explains the highly variable properties of zircon. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article Zircon. History of Jewelry: Zircon. Subscribe to: Posts (Atom). View my complete profile. Origin of Sterling Silver.
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