Prehnite

Carat weight is meaningful mainly for larger cabochons and freeforms that showcase uniform color and attractive translucency. Prehnite deposits can yield sizeable pieces, but larger stones that are relatively free of fractures and inclusions are less common and more desirable.

Color is a primary value factor. The most attractive prehnite displays an even, medium apple-green to yellow-green color, sometimes with a subtle glow when backlit. Pale, grayish or heavily brownish tones are less desirable. Some collectors also value unusual colors such as nearly colorless or slightly bluish prehnite.

Prehnite often contains internal fractures, veils and inclusions. Stones with relatively uniform translucency and minimal eye-visible cracks are preferred, especially in larger sizes. Some fibrous or radiating inclusions can create interesting internal textures, but excessive cloudiness or severe fractures lower value and durability.

Prehnite is most often cut as cabochons, beads and freeforms. Good cutting emphasizes smooth contours, even thickness and a high polish that enhances its 'jelly-like' translucency. Faceting is less common but can yield attractive, softly glowing gems when clarity permits. Care must be taken to avoid exposing weak fracture planes.

Prehnite occurs in low-grade metamorphic rocks and hydrothermal veins in many parts of the world, including South Africa, Australia, China and the United States. Gem-quality material suitable for cabochons and beads is relatively abundant, though cleaner material for faceting is scarcer.

Demand is moderate and driven by beadwork, metaphysical markets and artisan jewelry that favor its soft, soothing colors. Prehnite is also popular in crystal healing communities, which supports consistent if niche demand.

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