This is a comparison of 0.3ct ideal cut, D color, VVS1 clarity Round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $830

White Flash: N/A

Abazias: $1036

Blue Nile: $1090

Brilliant Earth: $1070

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.