Antique 14K Gold Brooch Pin Imperial Victorian Edwardian Opal Gemstone Jewelry. This product data sheet is originally written in English. For your consideration is a rare and important original antique c. 1900 Imperial Victorian / Edwardian 14K gold brooch / pin, featuring a beautiful natural cabochon opal gemstone, set at center. Rare Victorian brooch is hallmarked for imperial period gold, including workmaster initials. Weight: 2.2 grams. Natural Opal gemstone measures approximately 8.0mm x 5.0mm. One of a kind.