Antique Australian 18ct Yellow Gold Boulder Opal Brooch Circa 1890
Outstanding Australian 18ct yellow gold brooch centring a large oval en cabochon boulder Opal weighing 37.2cts and measures 33.5mm x 23mm.
Blooming, a popular finishing technique for karat gold jewellery from 1870 to 1890, was first documented in 1853. The means for creating a bloom finish involved dipping a gold item into a boiling mixture of hydrochloric acid (muriatic acid), saltpeter (potassium nitrate), salt and water. This process burned off any alloys on the surface resulting in an alloy-free, thin layer of soft, pure gold on the item.
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