by sriggs » Dec 11, 2001 Recently I'm been serching for an engagement diamond ring with a stone which ranges from .5 to .75 caret weight. I went to Tiffany and the representative told me that any diamond they sell below 1 caret has the Tiffany certification and any stone above 1 caret has a GIA certification. I went to a few other stores and they have GIA for all the stones whether it's GIA or another. My question(s) are: 1. Is it better to have a Tiffany certification rather than a GIA? Or does this open up for favortism since they're given they're own certification in house? 2. Should I go elsewhere to get a diamond that is GIA certified...would it be better? I was reading somewhere there the GIA certification is strict?