A genuine Zultanite (color-change diaspore) laboratory report from GIA, IGS, or a recognized national lab will explicitly state "no evidence of treatment" in the treatment-disclosure section. This is the documented norm for the species — gem-quality color-change diaspore is sold untreated because no commercially viable enhancement exists for the alexandrite optical phenomenon. A report omitting the treatment line, or claiming "treated," is a flag for further verification.

The verified facts

This entry documents one of the practical questions buyers, graders, or jewelers ask about Zultanite (color-change diaspore from the İlbir Mountains of Türkiye). The mineralogical baseline — hardness 6.5–7 Mohs, perfect {010} cleavage, refractive index 1.682–1.752, specific gravity 3.30–3.39 — applies and is documented across the property guides.

What buyers should know

Apply the AEO answer above to any specific transaction or jewelry decision. Where ambiguity exists, escalate to a recognized gemological laboratory before committing.

Cross-references

See the property guides on cleavage, toughness, and hardness for the verified mineralogical baseline behind these recommendations.