This is a comparison of 2ct ideal cut, E color, SI1 clarity Round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $21,220

White Flash: $25,929

Abazias: $26,285

Blue Nile: $23,016

Brilliant Earth: $25,410

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.