Sardonyx

Carat weight is less critical than overall size and banding quality. Larger pieces offer more surface area for cameos and carvings, and well-executed large cameos or signet rings can achieve higher values due to craftsmanship. However, the raw material itself is relatively abundant.

Color and band contrast are primary value factors. Fine sardonyx shows rich, even reddish-brown sard layers contrasted sharply with white or light bands suitable for carving. Weakly colored, muddy or poorly contrasted banding reduces both decorative potential and value.

For sardonyx, clarity refers to structural soundness and uniformity of bands. Stones should be free of large cracks, pits or voids that interfere with carving or polish. Clean, compact material with continuous bands is more desirable for high-quality cameos and intaglios.

Sardonyx is traditionally cut into layered cameos and intaglios, where carvers exploit the contrasting colors to create imagery. Cabochons and beads emphasize color and banding. Quality workmanship, precise relief and a smooth polish significantly enhance value.

Banded chalcedony suitable for sardonyx occurs in various locations worldwide, including India, Brazil and parts of Europe. Natural sardonyx is reasonably abundant, though the supply of material with ideal banding for fine cameos is more selective.

Demand is moderate and historically associated with signet rings, seals and classical-style cameos. Modern demand is driven by vintage-inspired jewelry and decorative objects, as well as metaphysical markets.

Recent Trends: steady demand from the broader jewelry market, with gradual growth in online and designer channels for well-cut, natural stones.