Science ensures a Holloway diamond™ sparkles like no other

For over 40 years, Garry Holloway has helped shape the science of diamond cut. As the inventor of the Ideal-Scope and ASET light performance tools — now used worldwide by leading gemmologists, polishers and dealers — his work has transformed how diamond beauty is measured and understood.

This landmark paper, written by The Cut Group alongside Sir Gabi Tolkowsky and leading international scientists, remains one of the most important studies ever published on diamond brilliance and human vision.