This is a comparison of 1.5ct ideal cut, G color, VS1 clarity Round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $17,590

White Flash: $19,086

Abazias: $19,597

Blue Nile: $18,858

Brilliant Earth: $21,650

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.