This is a comparison of 1ct ideal cut, D color, VVS2 clarity Round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $18,390

White Flash: $20,255

Abazias: $19,764

Blue Nile: $20,287

Brilliant Earth: $20,280

These diamonds are independently inspected and graded by GIA/AGS, which means you can trust their quality. For everything you need to know about buying engagement rings online, please visit http://howiboughtthering.com.