The lobes of the Heart may look completely different on one stone than another and yet you wouldn't necessarily be able to determine that from the measurements of the Stones. 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. There are 58 facets in a Round Brilliant Cut including the culet.
Rounds are the most expensive cuts, and with good reason.
Not Applicable Another thing to look for in Fancy Shapes is that the Diamond has a nice length to width ratio. The typical Marquise Brilliant contains 56 facets. The Emerald Cut is rectangular with cut corners. It is a step cut as opposed to a brilliant cut. The facets are broad with flat planes resembling the steps of a stair.