Prase

Prase is a chalcedony, a cryptocrystalline form of silica composed of fine intergrowths of the minerals quartz and moganite. It is characterized by its translucent, milky to deep green color. The green hue is typically due to the presence of trace amounts of nickel or chromium. Prase is relatively rare compared to other varieties of chalcedony. It is often found in association with serpentinite rocks.

Historically, prase has been used as an ornamental stone. Its attractive green color made it suitable for carvings, beads, and small decorative objects. It has also been mistakenly identified or confused with other green stones, sometimes leading to historical inaccuracies in gemological descriptions. The precise origin and extent of its use in ancient times can be difficult to ascertain due to these potential misidentifications.

In modern times, prase is collected by mineral enthusiasts and gemologists. It is not a widely used gemstone in jewelry due to its rarity and the availability of other, more vibrant green stones. However, where found and polished, it can exhibit a pleasing waxy luster. The color of prase can vary significantly, from a pale, almost yellowish-green to a deep, rich emerald green. The translucency allows light to penetrate the stone, giving it a subtle glow.