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Fine Jewelry University Articles matching: “Ring stamped with letter u and an arrow”
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Fine Jewelry University (Show All FJU Articles)
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Gem in the Spotlight: Spinel
… the title of an action movie, but it could also be the title of this article. For years spinel has been confused with other gems and even today is often used as a substitute for similar looking stones. In recent years, spinel has started… of the industry get on board. If you know someone born in August, it’s time to get excited. Gemology of Spinel With a Moh’s hardness of 8 and good toughness spinel is a great choice for all forms of jewelry. We recommend occasional wear …
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What Are Lab Grown Diamonds?
… describe lab grown diamonds and their cousins, and not everyone uses these terms in the same way. So, let’s begin with some vocabulary. Synthetic. Understanding this term correctly is the key that unlocks this entire question. Synthetic … world, synthetic is a highly technical term. When speaking technically, synthetic gems are man-made crystals with the same crystal structure and chemical composition as the specific gem that is being created. Therefore, a “synthetic …
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The Magic of Polarized Light
… from one number to the next. Once you know if a stone is doubly refractive or not you can use that information to narrow down the list of possible candidates of what the stone could be. A great example of this phenomenon can be seen when … polarizing filter. These filters have a coating on them applied in such a way that all of the molecules are aligned with each other so only a certain vibrational direction of light can pass through. This means that all of the light that …
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Fake Diamonds: The Great Diamond Attack
…a fully natural diamond from all the modern possibilities is quite demanding. So what is a real diamond? Let’s start with the older diamond look a likes, (CZ, GGG, YAG, Synthetic corundum and spinal, Glass) or simulants are quite easy to …. Apathy and sloppy observation can let one of the older lookalikes get by, but generally the profession is dealing with these well known simulants easily. The diamond tester (thermal inertia testers) is the front line in finding diamond …
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Gem in the Spotlight: Aquamarine
… has some illustrious cousins in addition to a rich history of its own. The Mythology of Aquamarine Long associated with tranquility and happiness, aquamarine was also thought to instill courage, cure laziness, and sharpen the intellect. … was believed to guarantee a happy marriage Best known for its beautiful blue color, aquamarine was used to bring happiness, eternal youth, and control passion. In the body, aquamarine was thought to reduce swelling, prevent convulsions, …
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Gem in the Spotlight: Tanzanite
…. The deep hues of violet, indigo, and blue come together in an unrivaled blend only found in tanzanite. Yet, even with its rarity and dynamic look, tanzanite is still less in price than more commonly known gems like rubies, sapphires, …this gem as blue zoisite. The vast majority (current estimates are around 95%) of tanzanite is heat treated to help bring out the vibrant blues. The stones that haven’t been heated by humans were heated through natural effects while they …
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Gem in the Spotlight: Morganite
… tree. It is a beryl gem which puts it in the same family as emerald and aquamarine. Because of its association with emerald it is sometimes called “Pink Emerald”. Other names for Morganite are “Pink Beryl”, “Rose Beryl”, and “Cesian (or … pink color is too light the stone often looks washed out and if the pink is too dark the stone looks too saturated with color and loses its Morganite air. Compared with many other gemstones, Morganite is a relatively new addition with …
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Gem in the Spotlight: Blue Zircon
… zircons can be transformed into colorless or blue zircons through heat treatments. Zircon is a durable gemstone with good hardness on the Mohs scale (6 to 7.5). However, Zircon has what is known as indistinct cleavage which creates a … tendency that can lead to chips, especially along facet edges requiring extra care when setting, cleaning, or wearing. The Mythology and History of Zircon Since it has been known from antiquity, Zircon has a rich mythology. Zircon is one…
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Gem in the Spotlight: Tsavorite Garnet
The discovery of Tsavorite in East Africa in the 1960s changed the jewelry world. Here was a gem with the color to rival the most exquisite emeralds and the clarity of the cleanest sapphires, all with the time tested … of garnet. Tsavorite is a unique form of garnet with a 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 … variety of garnet found primarily in Russia. Tsavorite is 7.5 on the Mohs scale. It is a green grossular garnet with a chemical make-up of CA 3 Al 2 (SiO 4 ) 3 . It has a Refractive Index (RI) of 1.740 and a dispersion index of 0.028. So…
