Demantoid price: what demantoid garnet is worth per carat
Demantoid is a rare green garnet with more fire than diamond. Its value rests on a vivid green colour, its exceptional dispersion, and — uniquely — the presence of "horsetail" inclusions.
What drives demantoid price
Demantoid is a green andradite garnet famed for dispersion (fire) exceeding diamond. The most valued colour is a vivid, slightly yellowish to pure green. It is rare, especially in larger sizes, and generally untreated (though some material is heated).
Colour, origin & the horsetail
Top colour is an intense green. Russian (Ural) demantoid is the classic, most valuable source and is prized for radiating "horsetail" inclusions — a rare case where a specific inclusion adds value as a mark of origin. Namibian and other African stones are often cleaner and pure green but lack the horsetail.
Size & clarity
Demantoid is rarely found in large sizes, so clean stones above 1–2 ct climb steeply in per-carat price.
Demantoid Garnet price — frequently asked questions
Why is demantoid garnet so valuable?
It is rare, has fire greater than diamond, and fine stones above a carat are scarce. Russian material with horsetail inclusions is especially prized.
Do horsetail inclusions increase value?
Yes — uniquely for demantoid. A fine radiating "horsetail" inclusion identifies prized Russian (Ural) origin and can add value rather than reduce it.
Which demantoid origin is most valuable?
Russian (Ural) demantoid is the classic and most valuable, especially with horsetail inclusions. Namibian stones are often cleaner but generally more affordable.
How much is demantoid per carat?
Fine stones are among the more valuable garnets, rising sharply with size, colour and origin. Use the calculator to estimate a range.
Indicative trade information from the Gem Index universal pricing engine — not a formal appraisal or laboratory certificate. Wholesale, USD. Species, treatment and origin should be confirmed by an accredited gem laboratory before sale. See our full disclaimer and methodology.