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Epiasterism, such as that seen in sapphire and most other gems, is the result of a reflection of light on parallel arranged inclusions inside the gemstone. Diasterism, such as that seen in rose quartz, is the result of light transmitted through the stone. In order to see this effect, the stone must be illuminated from behind.
A rarer type, which comes from the Mogok area of Myanmar, features a vanadium chromophore, the same as is present in Verneuil synthetic color-change sapphire. Virtually all gemstones that show the "alexandrite effect" (color change or 'metamerism') show similar absorption/transmission features in the visible spectrum. This is an absorption band ...
The Star of India is a 563.35-carat (112.67 g) star sapphire, one of the largest such gems in the world. [1] [a] It is almost flawless and is unusual in that it has stars on both sides of the stone. The greyish-blue gem was mined in Sri Lanka [3] and is housed in the American Museum of Natural History in New York City.
Sapphires are a precious gemstone, a variety of the mineral corundum, consisting of aluminum oxide (α-Al 2 O 3) with trace amounts of elements such as iron, titanium, chromium, copper, or magnesium. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors.
The Star of Adam is an oval-shaped blue star sapphire, currently the largest star sapphire in the world. [1] [2] [3] It weighs 1,404.49 carats (280.898 g; 9.9084 oz). [4]Prior to its discovery in 2015, the Black Star of Queensland, weighing 733 carats (146.6 g), was the largest star sapphire gem in the world.
To disambiguate, lapis lazulī ("stone of lazulum") was used to refer to the stone itself, and is the term ultimately imported into Middle English. [11] Lazulum is etymologically related to the color blue, and used as a root for the word for blue in several languages, including Spanish and Portuguese azul. [11] [12]
There are even special products from sought-after designers like Zac Posen and Bella Vaughan, and the brand offers a wide selection of regular diamond and gemstone jewelry, as well. Blue Nile ...
This is a list of gemstones, organized by ... Some minerals made into gemstones may display a chatoyancy or cat's eye effect, these include: [1 ... Sapphire (var ...
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