【 ANTIQUE Opal Engraved Necklace 】 18th-19th Century Approximate Size: Chain 71cm Head 3.9cm (including butterfly) Weight: Approximately 14g Materials: Opal, genuine gold, copper, etc. Origin: England Period: 18th-19th Century Condition: Verdigris present. As this is a very old item, the inner thread needs to be replaced if you intend to use it. Scratches, discoloration, etc... present.