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Fine Jewelry University Articles matching: “Thailand 925 ci”
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Fine Jewelry University (Show All FJU Articles)
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Gem in the Spotlight: Amethyst
…index as other varieties of quartz at 1.54-1.55 and is doubly refractive. It has a vitreous polish luster and its specific gravity is 2.66. Its chemical composition is SiO2. History and Lore The rich history of amethyst dates all the …amethyst. Amethyst has a long history of being used in jewelry and other decorative items. It was highly prized by ancient civilizations such as the Egyptians, who believed that amethyst had the power to protect against evil spirits and…
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Anatomy of a Ring
Knowing the different parts of a ring can help you make a better decision when choosing a new ring and it can help you know when your ring may need maintenance. It’s also a fun way to … knowledge of jewelry terms. Shank Every ring has a shank. This is the technical term for the band of metal that encircles the finger. There would be no ring without the shank. If the ring has a distinct design feature on the top part, … can wear thin—yes, even gold and platinum can wear away. In such cases a jeweler can “re-shank” the ring by replacing the metal at the bottom of the shank, going as far up the sides as the design and the extent of the wear require. If …
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The Birthstones
… day. Garnet varieties brighten the world in colors of yellow to gold, bright orange to true orange, brown to cinnamon, pinks to greens, and of course many shades of red. Garnets are given as symbols of consistency, perseverance and …give them courage and tame the sea. Aquamarine was used to bring happiness, eternal youth, and control passion. In ancient times the aquamarine was believed to instill courage in those who wore them. Learn more about Aquamarine April’s …
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Measuring Gold Weight
…There is more trivia about gold weights. The troy system historically was used for measuring the weight of drugs, precious metals and gemstones. The name comes from the French city of Troyes. The noble metals (gold, silver and platinum…grains = 1 pennyweight and 20 pennyweights = 1 ounce troy. Even more trivia if you’d like to read on. “Grain is an ancient unit which was originally based on the weight of a grain of wheat. The grain is the smallest unit of weight in …
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The Magic of Polarized Light
…: Radios, X-ray machines, and microwaves all use some form of a polarizing filter to allow them to function efficiently as they do without negative side effects. Using Polarized Light in Gemology Some gemstones, due to their unique … use of polarized light in gemology is to help identify doubly refractive stones. When using a refractometer, a circular polarizing filter is fitted over the magnifier. When twisted, if the stone is doubly refractive, the refractive …
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Gem in the Spotlight: Tsavorite Garnet
… stunningly vivid green color. It is bright and lively with a high refractive index giving it excellent sparkle and scintillation. Tsavorite is also a very rare gemstone. It is uncommon to find Tsavorite in sizes larger than five carats… of as a traveler’s stone offering protection and aid during long journeys. Garnet is also believed to aid in circulation and to protect against diseases. Tsavorite in particular is thought to provide its wearer with strength and …
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Gem in the Spotlight: Ruby
…as Burma), where rubies were first discovered more than 4,500 years ago. Other significant sources of rubies include Thailand, Vietnam, Sri Lanka, Tanzania, Mozambique, and Madagascar. Before modern gemology, for thousands of years, garnets, …. Since sapphires and rubies are the same gem material, they also share a refractive index of 1.762-1.770 and a specific gravity of 4.00. A unique optical property of rubies is that they emit fluorescent light at a very specific …
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Types of Necklace Chains
…-24k), the baht chain has been used as both an investment and a means of trade. The Baht is the official currency in Thailand, and it is named after a weight of silver (or gold) of the same name. One baht is approximately fifteen grams. … in design being comprised of round or oval links connected together one link at a time end over end. This simplicity gives them their timeless look, but it also gives them great strength and makes them one of the easiest styles to …
