Black Rainbow Ethiopian Opal Gemstone Sterling Silver Ring
Item Code: OP10103 Net Weight of ring: 2.6g Size of Ring: 6 3/4 (20.5mm). It can be adjusted to maximum 8 (or 23mm)
(The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. Pictures taken under natural sunlight and some with torch lights.)
This is a natural black Ethiopian Opal gemstone ring framed with Rose Gold plated 925 Sterling Silver adjustable size ring. The default size is 6.75. It can adjust to maximum size 8. The size of the opal gemstone is 7mm by 10mm.
Opal is a hydrated amorphous form of silica. It is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. The internal structure of precious opal makes it diffract light. Depending on the conditions in which it formed, it can take on many colors. Precious opal ranges from clear through white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black. Of these hues, the black opals are the most rare, whereas white and greens are the most common. Opals vary in optical density from opaque to semitransparent.