An enamel made of special porcelain used in jewelry as insignia and art objects.
See Alexandrite Tsarstone collectors guide, Definition of Jewel enamel, http://m.alexandrite.net/viewpage.html?id=GG-095-00002 (An enamel made of special porcelain used in jewelry as insignia and art objects.) (as of Jul. 25, 2026, 07:01 GMT).