The best way to judge shape appeal is to look at the stone's girdle outline without a Loupe, and decide if it's attractive. Round Brilliant Cut Rounds are the most popular Shape that Diamonds are cut into. It is also the most brilliant of all the cuts. This term refers to the attempt to cut a Diamond into the best proportions to achieve maximum brilliance. There are 58 facets in a Round Brilliant Cut including the culet.
Rounds are the most expensive cuts, and with good reason.
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