This is a comparison of 0.3ct ideal cut, D color, VS1 clarity Round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $710

White Flash: $849

Abazias: $896

Blue Nile: $964

Brilliant Earth: $1040

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.