Demantoid

Most demantoid stones are small; gems above 2 carats are rare and above 3–4 carats extremely rare, especially in top color and clarity. Carat weight therefore has a strong, nonlinear impact on value in fine-quality stones.

The finest demantoid shows a saturated, bright green to slightly yellowish-green color that remains lively in different lighting. Overly yellow, brownish or too dark stones are less valuable, while slight yellowish tones can be acceptable when combined with top brilliance.

Clarity is important but can be balanced against rare features such as ‘horsetail' inclusions, which are prized indicators of classic Russian origin. Eye-clean stones with strong brilliance command top prices; stones with heavy inclusions or noticeable fractures are heavily discounted.

Cutting is critical to maximize demantoid's high dispersion and brilliance. Well-executed brilliant or mixed cuts with correct proportions can display diamond-like fire, while overly deep or shallow stones lose life. Because rough is often small and included, cutters must carefully balance yield and performance.

Demantoid was first discovered in Russia's Ural Mountains and later in Namibia, Madagascar and other localities. Even with these sources, gem-quality production is limited, with small pockets of rough entering the market irregularly.

Demand is strong among connoisseurs and collectors who value demantoid for its fire, rarity and historical association with Russian imperial jewelry. It is also used in high-end designer pieces as a green alternative to emerald or tsavorite.

Prices for fine demantoid, especially Russian stones with documented origin, have increased notably, reflecting both limited supply and sustained high-end demand.