This is a comparison of 1ct ideal cut, F color, VS1 clarity Round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $10,390

White Flash: $12,301

Abazias: $13,092

Blue Nile: $12,173

Brilliant Earth: $11,905

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.