Heart shaped diamonds can differ a bit in their appearance depending on their structure and how they have been made; yet everyone agrees that they require good symmetry. They tend to have a length to width ration between 0.90 and 1.10, and they usually contain between 56 and 58 facets. The number of main pavilion facets can be anything from six to eight.
This is another diamond shape that is susceptible to the bow tie effect, which means a shadow can be cast on the central facets when light passes through. This can be reduced by adjusting the angles of the facets and the table so the light is diffused better. Another option is to alter the depth of the pavilion. In some cases, the large bezel facet at the point is replaced with ‘French tips’, i.e. a star and upper girdle facets.