Melanite

Carat weight has modest influence on price because black opaque gemstones compete largely on design and brand rather than rarity alone. Larger melanite cabochons or faceted stones with excellent polish and symmetry can be more visually impactful and attract higher absolute prices, but per-carat prices remain moderate.

Color is straightforward: the most desirable melanite shows a deep, uniform black with high luster and no obvious brown or gray undertones. Stones that appear dull, heavily included at the surface or unevenly colored are less attractive.

As an opaque stone, clarity is judged by surface and near-surface inclusions and the smoothness of the polish. Clean, compact material that polishes to a mirror-like finish is preferred; obvious pits, cracks or surface-reaching inclusions reduce the sharpness of reflection and value.

Melanite is cut into cabochons and faceted stones, often in step or brilliant styles. Cut quality is crucial in achieving crisp facet junctions and a high-gloss finish that showcases its luster. Poorly cut stones look flat and lifeless, while well-cut pieces can resemble black diamonds or spinels in appearance.

Andradite garnets, including melanite, occur in metamorphic and igneous rocks across various localities. While demantoid (green andradite) is rare and highly sought after, black melanite varieties are more common and available in reasonable quantities for ornamental use.

Demand for melanite is modest and focused on designers and consumers seeking natural black gemstones as alternatives to black onyx, spinel or 'black diamond.' It is also of interest to collectors of the garnet group.

Recent Trends: niche but stable collector interest, with fine, well-documented stones achieving strong prices through specialist dealers and auctions.