This is a comparison of 1.8ct ideal cut, F color, VS2 clarity round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $24,490

White Flash: $25,570

Abazias: $26,337

Blue Nile: $29,956

Brilliant Earth: $33,660

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.