
thumb|right|Tiger's eye thumb|right|Tiger's eye
thumb|right|Tiger's eye thumb|right|Tiger's eye
In gemology, chatoyancy ( ), also called chatoyance or the '''cat's eye effect''', is an optical reflectance effect seen in certain gemstones. (Historically, the term has applied specifically to gems; in woods and other materials the effect is more broadly known as "figure" or iridescence.)
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).