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This is a large 1 & 7/16" carved gray or brown pearl from the 19th century with pink and aqua iridescence. A brass ring studded with brilliant cut steels forms an inner border surrounding a silver rosette set with tiny white and red pastes to imitate diamonds and rubies. I haven't seen one like this before--the rosette does not move and the stones are bright. It has a swaged brass shank.
Button--Large 19th C. Carved Pearl and Paste with Brass Cut Steel Inner Border