Antique Edwardian 10k gold Greek Key cameo brooch pin. Unusual open pierced filigree Greek Key design bezel. Hand carved natural shell cameo has lovely detail. Measures 1-1/2" x 1-1/4". The cameo itself measures 1-1/8" x 7/8". Hallmarked "10K" on the cross brace underneath the pin stem. Pin stem is white metal. With folding safety clasp. In excellent no chips, cracks, or hairlines. All natural cameos when held to strong light will show very fine growth lines. These are neither hairlines nor cracks, they are natural to the shell and unique to each individual piece. Circa 1910-20.