18K Crystal Opal & Diamonds Ring
- Opal Type: Crystal Opal
- Origin: Mintabie – Coober Pedy – South Australia
- 18K Yellow Gold & Diamonds
- Stone Size: 8*6 mm
- Ring Size: 7 or O
The stone name opal comes from the Sanskrit word “Upala” for stone or precious stone.
The term “crystal opal” refers to any kind of opal (i.e. black opal, white opal, semi-black opal) which has a transparent, translucent, or semi-translucent body. This is also referred to as the “diaphaneity” of a stone. If light is able to pass through the stone, or you can see through an opal, then you are probably looking at a crystal opal. Crystal opals can display any colour of the spectrum in a beautiful play of colour.
However, boulder opals which have a layer of translucent opal are not referred to as crystal opals because of their opaque ironstone backing.
The translucence of a crystal opal often gives it a greater clarity and vibrancy of colour than opaque stones.
A black backing which is made of either black industrial glass, black patch (colourless opal), hard plastic, brown ironstone or sometimes vitrolite.
A thin slice of opal (normally crystal opal or white opal). The thickness of the opal in a doublet can vary, however, it is generally thicker than the opal found in a triplet. The edges of the slice of opal are generally rounded off (if there is enough opal) to give the stone a cabochon (domed top).