Why is it necessary to get a GIA or AGS cert with a diamond. It looks like those stones are way more expensive.
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Yes, Certificates ARE Crucial
If you want the best diamond price…always, always insist on a diamond grading certificate from GIA, AGS, or at least from EGL. (GIA and AGS are the world’s most respected gemological laboratories). Other certificates do not carry as much weight because they are either not as well respected or not as well-known.
Read my detailed tutorial page on certificates.
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