As a GIA certified Gemmologist with 30 years experience, I would give you this advice. Do your homework, and deal with a reputable diamond dealer. Most jewelry is sold to the public at triple 'key'(three times the wholesale price). So buyer beware. One of my buddies that bought a ring from a 'schmuck', and asked me to trade it in for a new one, because he was getting engaged to a good friend of mine. He told me he paid $13,500 for a 2.xx carat Marquis diamond with a platinum setting. I examined the ring and stone, and my heart sank. My friend was a medic in Vietnam and was head shot. This piece of crap ripped him for $12,000. I went to my wholesaler and told him the story, as a goodwill gesture he gave me $2000 for a trade-in for a beautiful 1.250 Ct. RB in a platinum setting. My buddy's mistake cost him $11,500. I sold him the stone and setting for my cost, $6xxx, minus the $2000 I got for the previous 'diamond' that was nearly unsellable, and he got a beauty.
ORLL: educate yourself, and keep your F**KING head down when the lead is flying.
GIB187th
PS: This a public service announcement, I don't want your business.