One word of advice, either learn about diamonds or get someone who does know to advise you. Its almost impossible to tell stones apart by eye, unless they are really bad stones, like ones with a yellow cast. Weight isn't the only thing, actually clarity and brilliance are just as important as weight, color is secondary unless its really bad. Anyone who thinks they can tell a v from vs from a vsi stone by eye is kidding themselves, yet the price for the same stize stone can double as you go from v to vsi quality. do insist on seeing the AGI or EGL certificate for the stone, it will tell you most of what you need to know, assuming some unscrupulous dealer doesn't switch certificates.
Sorry I just found out that the guy I knew in the business has moved back to Israel. Interesting fact, the diamond business in NYC is almost completely run by orothodox Jews and most of the better diamonds in the world are now cut in Israel (used to be Belgium).
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