Topic
Grading
Grading entries on Zultpedia cover how color-change diaspore is evaluated for color, clarity, cut, and carat weight, including the importance of color-change strength (the percentage shift between daylight and candlelight illuminants) as the dominant value driver across all per-carat price bands.
-
Gem Article
Is Zultanite Rarer Than Diamond? How to Read Rarity Claims
You will see Zultanite called “10,000” or even “11,000 times rarer than diamond,” but these numbers vary between sellers and do not trace to a measured, primary source — and “rarer than…
-
Gem Article
Zultanite Buying Guide — Questions to Ask Before You Buy
Before buying Zultanite, ask four things: Does the stone show a real, reversible colour change under daylight and warm light? Is it natural, untreated colour-change diaspore? Does it come with a report…
-
Property Guide
Toughness of Zultanite — Why Hardness Alone Lies
Zultanite's 6.5–7 Mohs hardness measures scratch resistance, not toughness. Toughness — resistance to chipping and cleaving under impact — is rated only "fair" for diaspore because of its perfect {010} cleavage. A…
-
Education Article
How to Read a GIA Zultanite Report
A GIA color-change diaspore report documents seven facts you must verify: species (must read "diaspore"), variety (must read "color-change"), weight to two decimals, dimensions, cut style, refractive index range (1.682–1.752 expected), specific…
-
Education Article
How to Insure Zultanite Jewelry
Insure Zultanite jewelry through a specialty jewelry-insurance carrier (Jewelers Mutual, Chubb, BriteCo) rather than relying on a homeowner's policy, which typically caps gem coverage at $1,000–$2,500. Insure for replacement value at current…
-
Gem Article
The Durability of Zultanite Jewelry — Hardness Versus Toughness
Zultanite's 6.5–7 Mohs hardness puts it in the "scratchable by quartz dust" range, suitable for occasional-wear jewelry but not daily-wear rings. More importantly, the perfect cleavage on the {010} plane gives diaspore…
-
FAQ Cluster
Zultanite Price and Value — Frequently Asked Questions
Zultanite has a suggested-retail price table from Zultanite Gems LLC ranging from USD 750 per carat for stones under one carat to USD 14,000+ per carat for stones above 20 carats. Per-carat…
-
Education Article
Buying Zultanite Without Getting Cheated — A Buyer’s Checklist
Five buyer protections for Zultanite: (1) demand a gemological lab report from GIA, IGS, or a recognized national lab confirming species and origin, (2) verify color change in person under multiple illuminants,…
-
Education Article
Caring for Zultanite Jewelry — Cleaning, Storage, and Wear
Zultanite jewelry needs three protections: (1) clean only with warm soapy water and a soft brush — never ultrasonic or steam, which can propagate cleavage, (2) store separately from harder gems (sapphire,…
-
Property Guide
Hardness of Zultanite — 6.5 to 7 on the Mohs Scale
Zultanite (gem-quality color-change diaspore) measures 6.5 to 7 on the Mohs hardness scale, comparable to peridot and below quartz. This places it in the moderately hard range — durable enough for pendants,…
