This is a comparison of 0.9ct ideal cut, G color, VS1 clarity Cushion cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $3420

Abazias: $3679

Blue Nile: $4682

Brilliant Earth: $5070

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.