Jardin is a technical term that relates to emerald. This noble gem from the beryl group is usually cloudy due to inclusions or hairline fractures. These imperfections are acceptable as long as they don't detract from the stone's lovely green color. In such cases, the lively play of colors caused by the inclusions is described as "jardin" - the French word for "garden" - and is regarded as proof of the genuineness of the stone. In no other variety of gemstone are flawed specimens so frequent and perfect specimens so rare.

This phrase is a general term for all ornamental stones and stone-like materials. The term is sometimes applied only to less valuable or nontransparent stones, but in most cases the phrase "jewelry stone" is used as a synonym for the phrase "precious stone." There is no clear distinction between the two terms nor any rigorously defined meaning for the phrase "jewelry stone."