Whether you're shopping for a sparkling engagement ring or everyday jewelry, I rounded up the 14 best places to buy diamonds ...

Turn any loose diamonds upside down over a newspaper ... While an extremely high-quality gem won't glow under UV light, this can be a good secondary test for questionable stones if you already ...

Gemstones, including rubies, emeralds, and sapphires, can be sold for cash, much the same as diamonds ... Low-quality alexandrite can sell for as little as $100, but high-quality stones can ...

GN offers retailers free analytics on high-demand natural diamonds by carat weight to maximize profits and cash flow.