They use SI, J quality stones in their platinum and 18k jewelry all the time. Couple screenshots, including their own website:I never paid attention to the diamond specs or looked at my valuations before, but I decided to go through them to see.
For “fashion” jewelry, Tiffany uses lower color diamonds with more clarity discrepancy.
G—J, IF—SI1
For “fine” jewelry, Tiffany uses higher color diamonds with less clarity discrepancy.
D—G, IF—VS2
The distinction is based on collection and not on diamond size, because my novo ring’s diamonds are super teeny tiny. So, something in the T, Atlas, or Return to Tiffany collection would have lower color diamonds than something from the Schlumberger or Victoria line.
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I was kinda shocked when visiting their store I asked to see the certificate for their Victoria necklace and saw I color SI quality there. People often think that by overpaying 5-10x for Tiffany jewelry they will get the best quality possible, but that is not the case.


