The Holloway Cut Adviser (U.S. Patent 7,251,619) is a rejection tool to help you narrow your search for only round diamonds potential Light Return, Fire, Scintillation and Spread based (only) on the proportion information from a grading report. HCA does not use symmetry, polish and minor facets info.

Consumers please visit here. Trade & diamond manufacturers please visit here
Trade can subscribe for new services, including uploading unlimited numbers of stones via excel spread sheets.