Opal types black is named because of its natural dark base color.
Opal types black can be Ni N2 dark black, N3 dark to dark gray N4 N5. The surface colors can range from a variety of blues and greens to red and all the brilliant colors of the rainbow. It is found in two centers of Australia Lightning Ridge in New South Wales. In the town of Mintabie in South Australia blue or dark gray N5, Lightning Ridge Opal is the better of the two due to brilliance and intensity of color. Lightning Ridge Black is the most expensive of all the types on a dollars per carat basis due to its absolute rarity and the demand from collectors around the world.
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Mape of all Australian opal types black white crystal and bolder.
Opal types wwwgrahamblackopal.com white stones has a whitish base color all over the stone the colors emanate from the white base ,one of the differences between White and Black and Boulder is the color play generally extends from surface to base, whereas the other two types have a naturally occurring single base color, differing from its surface colors. White is usually drawn from the mines in Coober Pedi and Andamooka in South Australia .
Opal types.
This is a high-quality Australian opal gemstone.
Boulder found only in Queensland this rare gemstone was formed from silicon dioxide and other minerals finding their way into the fissures of ironstone. The cutter must always take a little of this natural ironstone when extracting a gemstones and this gives the dark overall color which does not detract from the Boulder . When little or no ironstone appears in the face of boulder it’s a good stone. The natural occurrence of Boulder allows for particularly interesting shapes which in the hands of a creative jeweler makes for stunning jewelry.
Triplet is a three part piece consisting of the base plastic, a centre slice of opal which has been painted black on the underside to give a black stone look appearance and has a top of Quartz as a protection for the thin layer of gemstone.
Black opal from Lightning Ridge.
Opal types Australian.
Doublet same as a triplet but no quartz top,Matrix there are two types of Matrix, one is known as Andamooka Matrix which is sugar and acid treated, opal bearing rock. And the other is Matrix consists of thin seams or spots of precious colors. Matrix usually dark ironstone, occasionally a light sand stone. It is made up of layers of precipitated silica spheres and water, ordering of the spheres produce a diffraction grating crystal at Lightning Ridge A+, most opal types are mined in Coober Pedy in the State of South Australia.
