Victorian 18ct Gold Opal & Diamond Crescent Brooch

A sweeping crescent brooch set with well matched graded opals and small old mine cutAn 18th, 19th and early 20th century diamond shape, typically cushion or asymmetrical, marked by a small table, a high crown and a large culet. Culets are the small flat facets at the bottom of a stone which appear to the untrained eye as a hole in the middle of the stone. Before the advent of modern machinery which allows for the precise faceting we see tod… diamonds in between. It is 18ct75% pure gold (or 750 parts pure gold and 250 parts other metals) gold and was made circa 1890.