This is a comparison of 0.4ct ideal cut, G color, SI1 clarity Round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $860

White Flash: $963

Abazias: $982

Blue Nile: $952

Brilliant Earth: $1030

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.