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Scratching another stone with a suspect diamond is an excellent test of authenticity. Scratching determines the hardness of the stone, which is a key identifying characteristic for diamonds. More »

Online resale platforms, including Etsy, eBay and Ruby Lane, sell Eisenberg vintage jewelry. Collectors can also find vintage Eisenberg pieces at antique shows and antique shops throughout the country. More »

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Blowing breath onto a diamond, rubbing it with sandpaper, observing how it sparkles and how it refracts light are ways to determine its authenticity. Studying a diamond's imperfections is another technique, though this r... More »

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A diamond grading chart is a rating system for the internal characteristics and surface conditions of diamonds developed by the GIA, an independent non-profit laboratory that rates and certifies diamonds. The chart consi... More »

Good diamond testers identify diamonds based on their electric conductivity instead of heat conductivity. Testers that identify both properties are even more accurate. In addition, a good diamond detector should notify t... More »

A system developed by the Gemological Institute of America in the 1950s that grades diamonds by color, clarity, cut and carat weight determines a diamond's price. The value is affected by the quality and rarity of the fo... More »

In order to purchase conflict-free diamonds, a buyer should be knowledgeable about what constitutes non-conflict diamonds, ask questions about a stone's origin and request written proof of a stone's status. Utilizing a c... More »