
thumb|A collection of tourmaline cabochons in a variety of colours
thumb|A collection of tourmaline cabochons in a variety of colours
A cabochon (; ) is a gemstone that has been shaped and polished, as opposed to faceted. The resulting form is usually a convex (rounded) obverse with a flat reverse. Cabochon was the default method of preparing gemstones before gemstone cutting developed.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).