To me it looks halfway between round and oval in shape, but I don''t know anything about the facets/brillance. Why do people like this cut in particular? Thanks!
As much as I know, any rectangular or square diamond with rounded corners qualifies for the 'cushion' name. The face arangement varies alllot - some are brilliant cut some close to radaints some have pavilions similar to the princess cuts (this includes a branded version called 'Cushette') and who knows what else - basically any sort of modified brilliant and then some. Actually, if you look hard enough there's bound to be one or two with a step cut crown out there!
Hard to say if any such cut is better all the time - cut to optimized proportions they would probably come darn close in terms of brilliance etc. However, some cushion brilliants seem to be cut for brilliance - you have the branded Danile K and Kotlar cushions that qualify for the description. A few non-branded stones of the same breed are reffered to as 'modern cushion' on pricescope, but this is a local denomination.
On top of it all, try GoodOldGold.com for their H&A cushion brilliant!
There's allot to see out there!
Btw... I was looking to see if the H&A cushions are called 'cushion brilliant' or 'modiied...' by GIA, when this ghostly picture came along!