48 cts Boulder Opal Pendant, has hole bored out ready for a chain (I have many different styles that would suit) Nice play of colour, abstract rectangular shape. Originally from Winton mining area.

Beautiful colours, dancing and changing from different angles. This is pure Opal, with the colour and sparkle visible from top and bottom. 

7.3 cts A truly beautiful piece, Jewellery ready.

Treated, has slight bluish play of colour. Jewellery ready. I'm unsure of the origin, and where it was put together.

Opal is one of the world's most popular gemstones due to its flashing colors. Australia is the most famous producer of precious Opals along with Mexico and Ethiopia. Opal is softer than most other popular gemstones and lends itself best to pendants and earrings that do not receive heavy impact during wear. It is the birthstone to those born in October.

The formation of Opal is a fascinating process occurring over millions of years. It begins with silica-rich water seeping into crevices within various rock types. As the water slowly evaporates, it leaves behind deposits of hydrated silica. These microscopic spheres of silica arrange themselves in a regular pattern. This structure diffracts light, resulting in a dazzling play of colors known as Opalescence. Different geological conditions and trace elements can influence the base color and the intensity of the color flashes within Opal. The presence of iron oxide can impart reddish hues, while nickel may result in green tones.

52 cts