This is a comparison of 0.3ct ideal cut, F color, SI1 clarity Round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $540

White Flash: $728

Abazias: $650

Blue Nile: $618

Brilliant Earth: $875

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.