Topic
Identification
Identification entries on Zultpedia cover how to distinguish genuine Türkiye-source color-change diaspore from synthetic color-change sapphire, color-change garnet, color-change fluorite, and other-locality natural diaspore. Includes the field-test protocol, dichroscope and refractometer use, lab-report interpretation, and laboratory-grade trace-element analysis (LA-ICP-MS).
-
Gem Comparison
Zultanite vs Color-Change Sapphire
Zultanite (color-change diaspore, 6.5–7 Mohs, RI 1.682–1.752) and color-change sapphire (corundum, 9 Mohs, RI 1.762–1.770) differ in hardness, durability, optical character, and color-shift register. Sapphire shifts blue-to-purple/violet; Zultanite shifts sage-to-raspberry through a…
-
Gem Comparison
Zultanite vs Color-Change Garnet
Zultanite (color-change diaspore) and color-change pyrope-spessartine garnet are both moderately hard color-change gems but differ in mineral species, optical character, and per-carat price. Diaspore is biaxial positive with strong birefringence; garnet is…
-
FAQ Cluster
Zultanite vs Other Color-Change Gems — Frequently Asked Questions
Zultanite (color-change diaspore) is one of several color-change gems on the market, each distinguished by mineral species, hardness, source region, and the strength and direction of color shift. Alexandrite (chrysoberyl) is the…
-
FAQ Cluster
How to Identify Real Zultanite — Frequently Asked Questions
Identifying genuine color-change diaspore requires five tests: color change between daylight and incandescent illuminants, trichroic pleochroism via dichroscope, refractive index 1.682–1.752 with strong birefringence, specific gravity 3.30–3.39, and a recognized laboratory report…
-
FAQ Cluster
Zultanite Jewelry Care — Frequently Asked Questions
Zultanite jewelry requires gentler handling than harder gems. Clean only with warm soapy water and a soft brush. Never use ultrasonic or steam cleaners. Store separately from harder gems. Avoid daily-wear ring…
-
Gem Article
Zultanite Chain of Custody — From İlbir Mountains to the Buyer
Verifiable Zultanite chain of custody requires four documented stages: (1) mine of origin in Muğla Province with Türkiye export documentation, (2) cutter with named master-cutter attribution, (3) gemological laboratory report from a…
-
Glossary Term
Inclusion
Any solid, liquid, or gaseous material trapped inside a crystal during its growth. Inclusions in gem-quality diaspore are typically minute negative crystals, two-phase fluid inclusions, and rare boehmite or chlorite needles. Inclusion…
-
Education Article
How Much Is Zultanite Worth? — Price and Value Guide
Zultanite — gem-quality color-change diaspore from Türkiye — has a published suggested-retail price table from Zultanite Gems LLC ranging from USD 750 per carat for stones under one carat to USD 14,000+…
-
Gem Article
The Trace-Element Chemistry of Zultanite — Iron, Chromium, and the Color-Change Mechanism
Zultanite's color change is produced by trace iron (Fe³⁺) substituting into the aluminum site of the diaspore lattice, with chromium (Cr³⁺) contributing additional absorption in the red region. The combined absorption spectrum…
-
Gem Comparison
Zultanite vs Andalusite — Two Türkiye-Adjacent Pleochroic Gems Compared
Zultanite (color-change diaspore, 6.5–7 Mohs, RI 1.682–1.752, color-changing across three illuminants) and andalusite (Al₂SiO₅, 7–7.5 Mohs, RI 1.629–1.650, strongly pleochroic but not color-changing) are both trichroic but differ in mineral species, hardness,…
