Tanzanite · Certification
Certified Natural Tanzanite: What to Verify
A tanzanite certificate should confirm the stone is natural zoisite and note that heat treatment is present (as it is in the vast majority of tanzanite on the market) — this is a routine, expected disclosure rather than a red flag. The report should also describe color grade, since saturation is the primary value driver for this specific gemstone.
Our authenticity standard for Tanzanite
Whenever a certificate is available, it's shared with you before you pay — the same commitment described in full on our site-wide Authenticity & Certification page. Because our dealer network sources through multiple independent gemological laboratories, the specific issuing lab may vary by stone; what stays constant is that the report is independent, not a seller's own letterhead.
Once you have a report number, most independent laboratories offer free online verification — compare the certificate in your hands against what the lab's own database shows before finalizing any purchase.
Ready to see it applied to a real stone? See current Tanzanite buying guidance and Tanzanite pricing.
Common Tanzanite Certification Questions
What should a tanzanite certificate state about treatment?
It should confirm heat treatment, which is present in the vast majority of tanzanite on the market and is a routine, accepted disclosure rather than a concern.
Have a Certificate You'd Like Explained?
Our team is happy to walk you through any tanzanite report before you buy.