This is a comparison of 0.75ct ideal cut, H color, VS1 clarity Princess cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $1790

White Flash: $2284

Abazias: $2482

Blue Nile: $2685

These diamonds are independently inspected and graded by GIA/AGS, which means you can trust their quality. The quality of these diamonds is identical--the only thing that is different is the price. For everything you need to know about buying engagement rings online, please visit http://howiboughtthering.com.