Considered by some to be the most romantic of all diamond cuts, the heart shaped diamond is essentially a pear-shaped diamond with a cleft at the top. Heart shapes may differ slightly in appearance depending on their make and structure. The traditional heart shape should have a ratio between 0.90 and 1.10 and be absolutely symmetrical with the lobes (top arches) of even height and breadth. The heart shape is usually comprised of between 56 and 58 facets, although the number of main pavilion facets may vary between 6, 7, and 8.
A heart-shaped diamond with a high grade cut, likely had a skilled cutter. The most important elements to consider with the heart shape are the quality of the curved cut and finish as these determine the sparkle of the gem.
A difficult cut to purchase online, if you find one you absolutely like, make sure the seller has a good return policy.