This is a comparison of 0.4ct ideal cut, F color, VS2 clarity Round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $950

White Flash: $1062

Abazias: $1080

Blue Nile: $1077

Brilliant Earth: $1200

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.