This is a comparison of 1.5ct ideal cut, F color, SI1 clarity Round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $15,600

White Flash: $17,441

Abazias: $17,434

Blue Nile: $17,301

Brilliant Earth: $18,100

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.