Cabochon is approximately 40 mm long and 20 mm wide. Bail is sterling silver. The pendant comes with an 18" black satin cord. If you'd like a different length, please let us know. We have 16", 20", 22", & 24" cords available. The blue opallized petrified wood cabochon is from Indonesia, and made into jewelry in the US by Chris and Theresa.