ufansius: Opal/matrix cameo brooches - Wilhelm Schmidt, late 19th century. Schmidt pioneered this ca
ufansius:Opal/matrix cameo brooches - Wilhelm Schmidt, late 19th century.Schmidt pioneered this cameo technique in the 1870s; using a slab of matrix overlain by a thin layer of opal, he carved a figure in the underlying matrix and its accoutrements from the opal layer. -- source link
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