I guess this doesn’t need mentioning anymore, but
loosediamonds are REALLY EXPENSIVE. Naturally you’ll want it mounted only on metal fitting of its value and beauty. A diamond will almost never be set on silver, only on high quality gold, white gold or platinum. Look for markers such as 10K, 14K, 18K, these are stamps usually found on the inside of gold bands. The numbers 585, 750, 900, 950, PT and Plat are used to designate the purity of platinum and can be found on the inside of platinum bands. Anything that says CZ means you don’t have a genuine diamond mounted on your ring but a cubic zirconia.