LOT-GB65. For your consideration is an exceedingly rare and important original antique c.1890s Imperial 14K gold and guilloche enamel brooch / pin, featuring a single white natural diamond at center. Form is triangular. Constructed from 14K gold and cobalt blue guilloche enamel in traditional starburst pattern. There is a CHIP to the guilloche enamel. See images. Condition is original. Hallmarked for imperial 14K gold. Workmaster hallmark. Antique Victorian brooch / pin measures approximately 1.5" x 0.5". Weight is 3.95 grams. Museum quality. One of a kind.  Authentic and correct.