6.24 cts Natural Octagon-cut Green SI1 Demantoid Garnet (Russia)

Description

6.24 cts Natural Octagon-cut Green SI1 Demantoid Garnet (Russia)
New without Tags.  This garnet has never been used/placed/set in a setting.
It is utterly undamaged, unmarred and in perfect condition as expected of NWOTags.
I have included a Demantoid Garnet article below for your appreciation and enjoyment.
Summary of below:
"
Demantoid garnet
is a brilliant green variety of
andradite garnet
, colored by chromium and ferric iron. It is considered to be the rarest and most valuable member of the
garnet group of minerals
. Demantoid has an exceptionally high refractive index making it not only the most
brilliant garnet
but also more brilliant than both ruby and sapphire. Demantoid garnet also has exceptional fire and boasts the highest dispersion rating of any jewelry gemstone available today, even exceeding that of fine diamond. Like most green garnets, demantoid is typically found only in small sizes. Specimens over one carat are rare and specimens over 2 carats are very rare indeed. In fact, demantoid garnet is traditionally considered to be one of the rarest colored gemstones today.
"   ...   "
Like most garnet varieties, demantoid garnet is not known to be treated or artificially enhanced in any way.
"
Type:  Natural Demantoid Garnet
(personally confirmed as genuine Demantoid Garnet by digital refractometer (RI=1.910), dichroscope, polariscope, spectroscope, UV short&long-wave light, measured Specific Gravity=3.98) -- captej2012
Color:  Green
Shape:  Octagon-cut
Size:  12.82mm x 8.82mm x 5.41mm
Weight:  6.24 cts
Clarity:  SI1 (translucent)
Hardness: 6.5-7.5 Mohs
Luster: Excellent
Treatment: Not Heated, Not Enhanced, Not Treated
(Garnet is not responsive to treatment)  --  captej2012
Origin:  Russia
Green Garnet Queen -- seated beside me Alone,
They say you're just a Stone.
But if so Why do I feel you?
Why do I hear you?
How Comforting your Presence.
How Close when we Whisper.
Is My Need that you're There?
Or Your Need that I am Here?
Whichever Be We have One Another.
Whatever Be We are One Another.
So Take you They will,
No Matter If They Do.
They Want What We Are.
So Go Yet We Remain.
Go Share What We Are.
Whatever Be We Remain.
We are an eBay eStore enterprise focused on selling mostly Loose Natural Gemstones.  Stay here, look around and learn.  Via eBay Messaging, ask us questions, make an offer, and otherwise discuss your wishes, concerns and hopes.  We pride ourselves as good-spirited folks having fun and doing our best to share the joy of Nature's most beautiful and enduring literal treasure -- Natural Gemstones.  Expect to find us cheerful and trustworthy, and we will expect the same of you.  For us, Negative FeedBack as a means of coercion is never needed and only degrades everyone's enjoyment in what should otherwise be a fun shopping experience.          And finally, please enjoy my work as eBay's First (unofficial) Gemstone Poet.  --  captej2012
===========================================================
From URL:  https://www.gemselect.com/gem-info/demantoid-garnet/demantoid-garnet-info.php
Demantoid Garnet Gemstone Information
About Demantoid Garnet - History and Introduction
Demantoid garnet
is a brilliant green variety of
andradite garnet
, colored by chromium and ferric iron. It is considered to be the rarest and most valuable member of the
garnet group of minerals
. Demantoid has an exceptionally high refractive index making it not only the most
brilliant garnet
but also more brilliant than both ruby and sapphire. Demantoid garnet also has exceptional fire and boasts the highest dispersion rating of any jewelry gemstone available today, even exceeding that of fine diamond. Like most green garnets, demantoid is typically found only in small sizes. Specimens over one carat are rare and specimens over 2 carats are very rare indeed. In fact, demantoid garnet is traditionally considered to be one of the rarest colored gemstones today.
Demantoid garnet was first discovered in the Ural Mountains of Russia, and although garnets have been known for ages, demantoid wasn't discovered until 1853. Today, Russian demantoid is considered extremely rare and very valuable. Russian demantoid is highly prized for its distinctive golden 'horsetail' inclusions, owed to the presence of byssolite or chrysotile asbestos; but not all Russian demantoid exhibits golden thread-like inclusions. Other origins, may also produce
similar
inclusions but rather than being caused by traces of asbestos, they are regarded as characteristics of serpentinite geographic origins.
Demantoid Garnet
Identifying Demantoid Garnet
Demantoid belongs to the
andradite variety
of garnet and can be identified by its calcium iron silicate content. It has specific gravity (density) ranging from 3.7 to 4.1 and an extremely high refractive index of 1.88 to 1.94 (higher than sapphire and ruby). Demantoid is the most brilliant of all garnets, with only diamond and some zircon having greater brilliance than demantoid. Demantoid garnet has a dispersion that exceeds diamond and an adamantine (diamond-like) luster. Demantoid is colored by chromium and ferric iron. It rarely occurs in large sizes, which can help identify it from other similar gems such as peridot, grossularite, spinel, emerald, tourmaline or uvarovite garnet.
Demantoid Garnet Origin and Gemstone Sources
Demantoid garnet was first discovered in the Ural mountains in Russia in 1853; the Russian deposits remained the only source until a major find was discovered in Namibia (the Green Dragon Mine) in 1996. In 2003, there was another significant deposit discovered in Madagascar. More recently, there have been reported findings in Afghanistan, Italy, Iran, China, Korea, Zaire and the USA.
Buying Demantoid Garnet and Determining Demantoid Garnet Gemstone Value
Demantoid Garnet Color
Demantoid garnet by definition is always green, its characteristic color is caused by traces of chromium. The yellowish colors are owed to ferric iron. Colors range from a light yellowish-green (similar to peridot) to a deep green, almost the color of fine emerald. Specimens with a more intense green are more highly valued, but the lighter stones display substantially more fire.
Demantoid Garnet Clarity and Luster
Demantoid garnet is known for its high transparency and adamantine (diamond-like) luster. Inclusions are common for demantoid garnet, especially in stones weighing over 1 carat. Eye-clean stones of under 1 carat weight can be found but most will have some visible inclusions. With Russian demantoid, horsetail inclusions are welcomed as a desirable characteristic.
Demantoid Garnet Cut and Shape
Demantoid garnet is typically faceted rather than cut en cabochon. The most common shape is oval as it preserves the most original rough carat weight, which is especially important since most stones are quite small. Other popular shapes include round, pear, cushion and fancy cuts.
Diamond-cut stones
are quite popular due to their ability to maximize demantoid's remarkable brilliance and fire.
Demantoid Garnet Treatment
Like most garnet varieties, demantoid garnet is not known to be treated or artificially enhanced in any way. In 2003, rumors circulated that some Russian material may have been enhanced through low heating, but gemological tests were unable to detect the treatment.