This is an early 20th c. brooch with an octagonal cabochon of Blue John. Wiki says "Blue John (also known as Derbyshire Spar) is a semi-precious mineral, a form of fluorite with bands of a purple-blue or yellowish colour". It in set in silver plated nickle without any marks. The marcasites are real. not glass, and brilliant! It measures 2 by 1 & 1/4".
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