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I'm not too sure about buying online.
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You might want to scan through this forum and check consumers' posts about their experience.
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Also, I was told that this diamond was ideal cut, how do I know this is true?
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It can be if you mixed Table and Depth. Does the diamond has a grading report? From which lab (e.g. GIA, AGS, EGL, etc)? Whould it be possible to get crown and pavilion angles for the diamond (Saring or Ogi measurements)?