Highly polished and domed, these oval AA grade Prehnite cabochons are a must have. These beauties are 25 x 18mm, with a 8-9mm height on average. The color is a wondrous transluscent green with flecks of black tourmaline. No two of these Prehnite cabochons are exactly alike in coloring, but all of these domed cabochons are beautiful. Prehnite is said to highten prior knowledge of an event, and bestow the gift of prophecy.