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Fine Jewelry University (Show All FJU Articles)
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What are “Blood Diamonds”?
… areas controlled by forces or factions opposed to legitimate and internationally recognized governments, and are used to fund military action in opposition to those governments, or in contravention of the decisions of the Security …Kimberley Process. now more than 99% of the world’s diamonds are from conflict free sources While diamonds have been used to fund conflict, the problem is not the diamonds themselves but the rebels who exploit diamonds (along with other …
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Jewelry Solder: What You Should Know
…, and more. That’s great, but what does this have to do with solder? With solder a different set of alloy metals are used than with regular karat gold with the purpose of lowering the melting point of the finished metal. These metals–… zinc, cadmium, tin or indium–all have low melting points, and by controlling exactly how much of these metals are used metallurgists can determine the precise melting point of the finished alloy. How Solder Affects Jewelry Here is where …
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How to Clean Pearl Jewelry
… as gemstones produced by the heaving pressure beneath the earth’s surface. Therefore special attention should be used when cleaning them. Pearls should be the last thing that you put on and the first thing that you take off. Common … be cleaned in warm soapy water periodically, gently scrubbing individually with a soft brush. A soft brush must be used so as not to scratch the surface of the pearl. Care must be taken to clean well around the drill hole, but do not dip…
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Gem in the Spotlight: Ruby
… durable form of aluminum oxide with a Moh’s hardness of 9. This makes ruby one of the hardest gems commonly used in jewelry second only to diamond (which has a Moh’s hardness of 10) and moissanite (which is in between). Rubies only occur…that they emit fluorescent light at a very specific wavelength (694 nanometers) under certain conditions. Scientists used this fact to build the world’s first functioning laser in 1960 using a flashlamp and a synthetic ruby. This amazing …
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How to Tell If a Diamond Is Natural or Lab Grown
…One such machine is the DiaTrue screener which we have recently added to our own gem lab. This incredible machine is used by some of the world’s top gem labs and jewelry manufacturers daily, and it has already helped us catch undisclosed … harmful to humans) and analyze what the stone outputs. There are certain, tell-tale signs of the various processes used to make lab grown diamonds that show up as spikes and troughs at specific wavelengths in the spectroscopic analysis. …
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Gem in the Spotlight: Blue Zircon
…any colored gem. In fact, before any of the manmade diamond simulates were made, the colorless version of zircon was used in jewelry to mimic diamond. Why? Natural zircon is known for its scintillation, brilliance, and flashes of color or… material. This process breaks light into its spectral hues like a rainbow. Then the rainbow effect is broken and focused by the facets of the gem to create the brilliant light show we see. Zircon is also of interest to geologists because…
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Synthetic Gems: The Whole Story
… (also called GGG) and the modern diamond simulant Moissanite, a man made silicon carbide. In gemology, any material used to look like a gem is called a simulant. So clear glass, rock quartz, GGG, and Moissanite are all diamond simulants…of how hard it is to make synthetic is one of mankind’s stories of perseverance and creativity. Synthetic gems are used in science and industry every day. Gem quality synthetics make affordable jewelry that looks like high end gems that …
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Gem in the Spotlight: Sapphire
… put great faith in the stone. If its luster dimmed, one knew his or her spouse had been unfaithful. Sapphire refused to shine when worn by the wicked or impure. Known as the celestial gemstone, the sapphire has been treasured for …, decorating the Imperial Crown ordered by Queen Victoria. Deriving its name from the Greek word for blue, sapphire used to refer to any blue stone. By the late 1800’s, the sapphire and ruby were recognized as gem varieties of corundum. …
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Gem in the Spotlight: Tourmaline
… array of colors. In fact, tourmaline is found in almost any color you can imagine, and people have most likely used and appreciated it for hundreds of years. But, before the advent of modern gemology, most tourmaline was believed to be … electrically charged when under mechanical stress (squeezed or impacted). This effect allowed the stone to be used in early sonar systems in the First World War as well as in extremely sensitive pressure gauges in submarines. History and…
