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Gem identification is basically a process of elimination. Gemstones of similar color undergo non-destructive optical testing until there is only one possible identity. Any single test is nearly always only indicative. For example: The specific gravity of ruby is 4.00, glass is 3.15–4.20, and cubic zirconia is 5.6–5.9 . So one can easily ...
Hessonite or "cinnamon stone" is a common variety of grossular with the general formula: Ca 3 Al 2 Si 3 O 12. The name comes from the Ancient Greek : ἣσσων (hēssōn), meaning inferior ; [ 5 ] an allusion to its lower hardness and lower density than most other garnet species varieties.
Dispersion: 0.017 [1]: Ultraviolet fluorescence: Pink stones; inert to very weak red to violet in long and short wave [1]: Absorption spectra: Strong narrow band at 498 nm, and almost complete absorption of red down to 640 nm in blue and green stones; red and pink stones show lines at 458 and 451 nm, as well as a broad band in the green spectrum [1]
The word prasiolite literally means "scallion green-colored stone" and is derived from Greek πράσον prason meaning "leek" and λίθος lithos meaning "stone". The mineral was given its name due to its green-colored appearance. Natural prasiolite is a very light, translucent green. Darker green quartz is generally the result of ...
Specific gravity: Average 2.76: Optical properties: Uniaxial (−) Refractive index: n ω = 1.564–1.595, n ε = 1.568–1.602: Birefringence: δ = 0.0040–0.0070: Ultraviolet fluorescence: None (some fracture-filling materials used to improve emerald's clarity do fluoresce, but the stone itself does not) References [1]
[9] Cairngorm is a variety of smoky quartz found in the Cairngorm Mountains of Scotland. [10] It usually has a smoky yellow-brown colour, though some specimens are greyish-brown. It is used in Scottish jewellery and as a decoration on kilt pins and the handles of sgianan-dubha (anglicised: sgian-dubhs or skean dhu). [11]
Oregon Sunstone is unique in that crystals can be quite large. The copper leads to variant color within some stones, where turning one stone will result in manifold hues: the more copper within the stone, the darker the complexion. [9] On August 4, 1987, the Oregon State Legislature designated Oregon Sunstone as its state gemstone by joint ...
In 1967, British gem prospector and geologist Campbell R. Bridges discovered a deposit of green grossular in the mountains of Simanjiro District of Manyara Region of north-east Tanzania [3] in a place called Lemshuko, 15 km (9.3 mi) away from Komolo, the first village. The specimens he found were of very intense color and of high transparency.