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Showing all results for: “testing”
Videos
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At Home Gold Tests
… actually worked pretty well…and, some of them didn’t. We also explain how a couple of the more professional gold testing methods work. We demonstrate how to use a touchstone acid test kit and an electronic gold tester (see the links below…you used correctly. The basic idea is to apply acids of varying strength to very thin shavings for the piece you are testing. If an acid eats away the metal, you know that it is of a lower purity than the label on the acid. By comparing the …
Fine Jewelry University
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How to Tell If a Diamond Is Natural or Lab Grown
… to be absolutely, 100% sure whether a diamond is lab grown or natural, you can send it to specialized gem labs for testing. DeBeers and GIA (the Gemological Institute of America) have developed even more complex and sophisticated machines … responsibly disclosed and sold as lab grown diamonds. Many major diamond suppliers have even purchased the diamond testing machines we just discussed to screen their inventories for undisclosed lab diamonds. The jewelry industry as a whole …
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Star White Gold
… white may have sensitivity to the nickel in white gold. Star white gold has been evaluated by a leading independent testing laboratory. The Star White gold family of alloys does not require rhodium plating. They have been color tested by …
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Gem in the Spotlight: Topaz
…The famous “Braganza Diamond” was thought to be the largest diamond ever found (prior to the Cullinan Diamond) at 1,680 carats and was set in the Portuguese crown jewels as such. It wasn’t until many years later that more modern testing identified it as a clear topaz instead. Even though its true identity is now known, the large imposter still sits in the Portuguese crown jewels today. The name “Topaz” comes from the old Greek name “Topazios” for an island in Foul Bay, …
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Gem in the Spotlight: Amethyst
…. About 50% of amethysts on the world market are now believed to be synthetic. This is a fairly recent discovery as many low cost, high quality, deeply colored amethysts are now appearing in inexpensive jewelry. Because the cost of testing is higher than the cost of even the natural stones it is not often performed. Beware of stones of perfect clarity, calibrated sizes, and precision cutting. Notable Stones One of the most famous amethyst stones is in The Morris Amethyst …
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Types of Necklace Chains
… in recent years, and for good reason. It gives a big look like a herringbone or omega, but it also has the flexibility and strength that curb chains are famous for. PROS Strength – The curb chain design is simple and strong. In our testing, a moderately heavy curb chain took over 400 lbs. of force to break. Flexibility – Unlike other flat chain styles, curb chains are immanently flexible and very difficult to kink. Serviceability – If you do manage to break or damage your…
