A cabochon is a convex gem or bead that’s highly polished but not faceted. This is part of a complete episode.
polyvitro n.— «The 35-foot-tall piece, composed of a kind of molded plastic, is titled “Glowing Gemstone Polyvitro Chandelier” (2000).» —“Glass Exhibition Offers Much to Admire” by Kyle MacMillan Omaha...