This is a comparison of 0.9ct ideal cut, H color, SI1 clarity Round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $4420

White Flash: $4946

Abazias: $4870

Blue Nile: $4840

Brilliant Earth: $6255

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.