This is a comparison of 1ct ideal cut, D color, VS1 clarity Cushion cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $4890

Abazias: $5941

White Flash: $5989

Blue Nile: $6056

Brilliant Earth: $6410

These diamonds are independently inspected and graded by GIA/AGS, which means you can trust their quality. The quality of these diamonds is identical--the only thing that is different is the price. For everything you need to know about buying engagement rings online, please visit http://howiboughtthering.com.