This is a comparison of 0.60ct ideal cut, G color, VS2 clarity Round cut diamonds (click the dollar amount to be taken directly to the diamond):

James Allen: $1730

White Flash: $1837

Abazias: $2117

Blue Nile: $2157

Brilliant Earth: $2200

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.