This is a comparison of 0.9ct ideal cut, G color, SI1 clarity Round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $4610

White Flash: $5302

Abazias: $5283

Blue Nile: $4992

Brilliant Earth: $5160

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.