SEDA OPAL JEWELERY DOUBLET OPAL PENDANT This is a doublet opal made from natural crystal from Coober Pedy and backed on to ironstone from Queensland to look like expensive black opal.There is also natural fresh water mabe pearl with a green quartz crystal to enhance the pendant. The stone has been bezel set which helps protect it. The workmanship and quality is excellent. Sterling silver Size of opal 4 mm app Amount of silver used gramms app length of pendant mm app Total Weight of stones and silver: cts. Our jewelery manafacturing is contracted out to one factory in asia where i supply both the silver and stones to be set.This gives me control of the quality of both the silver and stones.