Pictures of Opal - Black, Fire, Boulder, Blue and Pink - Geology.com
Blue common opal is a highly regarded variety of common opal best known from sources in Peru, Oregon, and Indonesia. Owyhee blue opal mined in Oregon ranges in color from a light to a dark pastel blue. Blue opal beads from Peru sometimes contain tiny …
Fire Opal - Pictures and Definition of Fire Opal - Geology.com
Faceted Fire Opal: These three stones show the color range of "fire opal," a name given to specimens of opal with a fiery background color. The orange and yellow stones have a sleepy translucence, while the red stone is semitranslucent, almost opaque.
Synthetic Opal - Also Known as Lab-Created Opal - Geology.com
2019年8月13日 · Synthetic opal is a man-made material that has the same chemical composition, physical properties and appearance of natural opal.
Ethiopian Opals - Precious, Fire and Common Opal - Geology.com
These are now producing beautiful precious opal, fire opal, and black opal with spectacular play-of-color in a variety of patterns and body colors. Ethiopian opals are not only beautiful, but they generally cost less than similar-quality opal from Australia.
Oregon Gemstones: Sunstone, Thundereggs, Opal and More
Fire Opal: A faceted orange fire opal from Oregon. This stone weighs 1.17 carats and is 9mm x 7mm in size. Fire opal in a range of colors from yellow through orange and red is produced from several mines on the eastern side of the Oregon Cascades.
Common Opal Can Be Pink, Blue, Green, Yellow, Purple, Orange
2019年4月3日 · A spectrum of common opal colors: Pink opal from Peru; yellow and orangy opal from Australia and Nevada; green opal from Peru and Kenya; Blue opal from Oregon and Peru; purple opal from Mexico. The common opals above have been used to make beautiful beads, cabochons and tumbled stones.
Black Opal or Dark Opal - Pictures of Black Opal or Dark Opal
The dark bodycolor often makes the fire of black opal more obvious. This contrast of fire color to bodycolor makes black opals very desirable and sell for high prices. One of the specimens shown on this page is a solid black opal with a strong blue face-up color play.
Precious Opal and Play-of-Color - Geology.com
Play-of-Color in Opal: White light enters an opal, interacts with the tiny silica spheres that make up its internal structure, is diffracted into its component colors, and exits the opal in a flash of spectral colors.
What Is Boulder Opal? Photos and Descriptions - Geology.com
Boulder opal is a rock containing thin seams and patches of precious opal that are too thin or too small to cut into solid opal. Two popular cutting styles are: 1) a gem that shows seams and patches of precious opal within host rock, and, 2) a thin seam of precious opal as the face of a gem with a natural host rock backing.
Pictures of Pinfire Opal or Pinpoint Opal - Geology.com
What is a Pinfire Opal? "Pinfire opal" is a name used for opal that has pinpoints of fire throughout the stone. In the accompanying image, the white opal on the left is a pinfire opal cut from material mined at Coober Pedy, Australia. The black opal on the right is a pinfire opal from the Constellation Mine in Spencer, Idaho.