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Fine Jewelry University (Show All FJU Articles)
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How to Sell Your Jewelry
…). 24 karat is pure. 10 karat is 10/24 or .410 gold and the balance of weight is the alloys. 14 karat is 14/24 or .583 gold and 18 karat is 18/24 or .750 gold. Platinum most of the time is 90% pure and 10% alloy. Silver jewelry is … precious metals are troy ounces, pennyweights, and grams. The troy ounce is equal to 20 pennyweights (DWT) or 31.15 grams (learn more about measure precious metal weights ). So here is an example; say the spot price of gold is $300 …
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Gem in the Spotlight: Ruby
… most famous source of rubies is Myanmar (formerly known 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 … State Crown, is actually a red spinel. History and Lore of Ruby The first discoveries of ruby date back to 2,500 B.C. They were found alongside stone age tools in historic mines in Mogok, Myanmar. The Bible compares the price of … only the most expensive ruby in the world, it is the most expensive colored gemstone in the world. Weighing in at 25.59 carats, this ruby may not be the largest ruby ever found, but its color and cut is unrivaled. It is the most …
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Gold Purity and The Differences Between White and Yellow Gold
…Karat with a K is the purity of gold, Carat with a C is a measure of weight use mostly in gem weight (one carat is 1/5 gram). Karated gold used in engagement rings can be from 100% gold to as low as 37% gold. Gold’s karat grade is used… in other karat grades are listed in the table below: Karat Parts Gold to Alloy Percentage Fineness 9K 9/24 37.5% 375 10K 10/24 41.67% 417 14K 14/24 58.33% 583 18K 18/24 75.00% 750 22K 22/24 91.66% 917 24K 24/24 100% 999 The key to …
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Gem in the Spotlight: Amethyst
… that it can withstand daily wear and tear. Amethyst has the same refractive 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 … over the last 200 years which is why, despite its beauty, amethyst is such an affordable stone today. About 50% of amethysts on the world market are now believed to be synthetic. This is a fairly recent discovery as many low cost, …
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Gem in the Spotlight: Aquamarine
… the royal family jewels have been passed down for generations but this tiara she special ordered from Garrard in 1957. The Gemology of Aquamarine Like emerald, aquamarine is a member of the beryl family (along with morganite, heliodor… supplier of aquamarine where it is often found in shades of blue-green. Aquamarine has a refractive index of 1.577 to 1.583 and is doubly refractive. Aquamarine’s specific gravity is 2.72 and it has a Mohs hardness of 7.5-8.0. For …
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Gem in the Spotlight: Quartz
…. Sometimes you can see this structure with your naked eye as with Drusy Quartz, or you may need the aid of 10-50x magnification. This will not be a complete list, but it includes the most common gem varieties. Of these gems, Gold …, which means that it can withstand daily wear and tear very well. All quartz has the same refractive index at 1.54-1.55 and is doubly refractive. It has a vitreous polish luster and its specific gravity is 2.66 (may vary based on …
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Gem in the Spotlight: Morganite
…, here are a few of the gemological properties of Morganite. Its durability is rated as excellent. Its hardness is 7.5 – 8.0 on the Mohs hardness scale which is comparable to emerald, topaz, and spinel. Its refractive index is 1.560 – …
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Gem in the Spotlight: Pearl
… pearl is one of the most famous natural pearls in the world, and it has a fascinating history that spans over 500 years. The pearl was first discovered off the coast of Panama in the 16th century. Over the years, the La Peregrina … pearl is one of the largest and most perfectly symmetrical natural pearls in existence. It weighs approximately 50 carats and is considered to be one of the most valuable pearls in the world. The Hope Pearl is believed to have been …
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Alternative Metals for Men’s Jewelry
… which have different properties like hardness and ductility. There are more than 30 grades of titanium with Grade 5 (also called aircraft grade) being the most commonly used due to its incredible strength and workability. Our rings at…tungsten. This is why there is a wide range of prices for tungsten rings which can be seen from $10 dollars to over $500. Tungsten carbide jewelry is extremely durable. It is more durable than gold, palladium, silver, or platinum. Its …
