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Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O.It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.
Turquoise “Long prized for its healing properties, turquoise occurs naturally in several areas of the world, including the American southwest and Tibetan Plateau,” Salzer says.
Bisbee turquoise can be found in many different shades of color and quality, from soft, low quality pale blue, to the quality hard brilliant blue turquoise and almost every shade of blue in between. The highest grade of Bisbee Blue turquoise is almost lapis lazuli blue and has a brownish-red spiderweb matrix. Green turquoise is also found in ...
Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc.
Valued at $55 million, the necklace features 407.48 carats of diamonds set in 18-carat gold, making it the world’s most valuable necklace. It is currently owned by Mouawad, a Swiss and Emirati ...
The turquoise gemstone is the namesake for the color. Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (P O 4) 4 (OH) 8 ·4H 2 O. It is rare and valuable in finer grades and has been prized as a gem and ornamental stone for thousands of years owing to its unique ...
8. Grandidierite. Cost: $100,000 per gram or more Grandidierite is a gemstone that is a close cousin to serendibite, and both are extremely valuable. Grandidierite is named after its discoverer ...
Opal was rare and very valuable in antiquity. In Europe, it was a gem prized by royalty. [19] [20] Until the opening of vast deposits in Australia in the 19th century the only known source was Červenica beyond the Roman frontier in Slovakia. [21] Opal is the national gemstone of Australia. [22]