8.95 cts Natural Round-cut ColorChange Blue->Purple-Red IF/VVS Flourite (Brazil)

Description

8.95 cts Natural Round-cut ColorChange Blue->Purple-Red IF/VVS Flourite (Brazil)
New without Tags.  This gem 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 Fluorite article below for your appreciation and enjoyment of this rare find.
Summary from below:
"
Fluorite is considered to be one of most popular minerals in the world among gem and mineral collectors, second only to quartz. It is often referred to as '
the most colorful mineral in the world
' owing to its variety of brilliant colors."   ...   "
Due to the many color variations of fluorite, it can resemble a variety of gemstones; however, it can be easily distinguished by its relatively low level of hardness."   ...   "
Fluorite occurs in a range of colors from colorless to black. The hallmark fluorite color is purple, while other popular colors include blue, green and yellow. Rarer colors include colorless, pink, brown, black and reddish-orange. Intermediate pastels between the previously mentioned colors are also possible. Most fluorite is a single color, but a significant percentage of fluorite exhibits multiple colors arranged in bands or zones.
"   ...   "
Fluorite is typically unenhanced. However, some materials may have been enhanced through irradiation gamma rays to create interesting neon colors. Synthesized fluorite is also available in a variety of colors."
Type:  Natural Fluorite
(Personally confirmed as Natural Fluorite by digital refractometer (RI=1.435), polariscope, spectroscope, UV short&long wave light, measured Specific Gravity=3.17) -- captej2012
Color:  AAA Blue->Purple/Red color-changing
(also amazingly fluorescent under UV light)
Shape:  Round-cut
Dimensions:  12.88mm x 12.88mm x 8.58mm
Weight:  8.95 cts
Luster:  Beautiful
Clarity:  IF/VVS
Hardness:  4.0 rating on the Mohs Scale
Treatment:  Not Heated, Not Treated, Not Enhanced
Origin:  Brazil
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.  Though we list and sell by eBay standards, we strive for your confident satisfaction.  Within eBay's code-of-conduct, we can also decide in your favor (within reason) for any concern.  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 or ignore my work as eBay's First (unofficial) Gemstone Poet.  --  captej2012
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Fluorite Gemstone Information
About Fluorite - History and Introduction
Fluorite is considered to be one of most popular minerals in the world among gem and mineral collectors, second only to quartz. It is often referred to as '
the most colorful mineral in the world
' owing to its variety of brilliant colors. Fluorite was first described in 1530 and was originally referred to as 'fluorspar'. The mineral was strongly noted for its effectiveness as a flux for aluminum and steel processing. Today, the term 'fluorspar' is primarily used for the industrial and chemical form of fluorite, while 'fluorite' is the term used in reference to the gem and mineral.
Fluorite Fluorescence
In 1852, the phenomenon of 'fluorescence' was named after fluorite, since it was one of the first fluorescent minerals studied. The element fluorine was also named after fluorite. Fluorine is an essential element in the chemical ion of fluoride. Fluorite is frequently fluorescent under ultraviolet UV light. The fluorescence is thought to be due to impurities of yttrium or other types of organic matter within the crystal lattice. The color of visible light emitted when a sample of fluorite is fluorescing appears to be highly dependent on where the specimen was collected. Fluorescent colors of fluorite are extremely variable, but the typical color is blue; other fluorescent colors include yellow, green, red, white and purple. Some specimens have the added effect of simultaneously exhibiting different colors under long and short wave UV light.
Fluorite Crystal Habits
Fluorite has several different crystal habits that always produce well-formed clean crystals. The cube is the most recognized habit of fluorite, followed secondly by the octahedron. The octahedral crystal is believed to form at higher temperatures than the cube. Fluorite has perfect octahedral cleavage which means that when cleaved, it can produce a perfect octahedron or diamond shape. Cleaved octahedrons are popular in rock shops all over the world, while natural uncleaved octahedrons are much harder to find.
Natural Fluorite
Identifying Fluorite
Due to the many color variations of fluorite, it can resemble a variety of gemstones; however, it can be easily distinguished by its relatively low level of hardness. Some possibilities for confusion include
calcite
, but calcite is slightly softer and has a different crystal form. Quartz is much harder and lacks the cleavage of fluorite, while
apatite
is slightly harder and has a different crystal form. Another distinguishing characteristic of fluorite is its property of thermoluminescence; the ability to glow when heated. One variety of fluorite known as 'chlorophane' demonstrates this well and can display thermoluminescence even when held in the hand. The thermoluminescence is green to blue-green.
Fluorite Origin and Gemstone Sources
Fluorite deposits are found in many locations around the world. Some of the most significant finds are located in Argentina, Austria, Canada, China, England, France, Germany, Mexico, Morocco, Myanmar (Burma), Namibia, Russia, Spain, Switzerland and the United States.
The unique variety of 'chlorophane fluorite' is found in very limited quantities at Amelia Court House, Virginia; Franklin, New Jersey; the Bluebird Mine in Arizona, USA; Gilgit, Pakistan; Mont Saint-Hilaire, Quebec, Canada and at Nerchinsk in the Ural Mountains of Russia.
A purple-blue and white banded variety of fluorite known as 'Blue John' is mined from Castleton in Derbyshire, England. Only a very small quantity of Blue John is mined each year for gemstone and ornamental use.
China has recently become a source for a type of fluorite that has similar color and banding to 'Blue John' fluorite.
Buying Fluorite and Determining Fluorite Value
Fluorite Color
Fluorite occurs in a range of colors from colorless to black. The hallmark fluorite color is purple, while other popular colors include blue, green and yellow. Rarer colors include colorless, pink, brown, black and reddish-orange. Intermediate pastels between the previously mentioned colors are also possible. Most fluorite is a single color, but a significant percentage of fluorite exhibits multiple colors arranged in bands or zones.
Fluorite Clarity and Luster
Fluorite has an attractive vitreous luster and gem-quality specimens should be free from inclusions visible to the eye. Gem grade fluorite typically occurs with excellent transparency, while lower-grade, industrial and commercial-use fluorite is often translucent.
Fluorite Cut and Shape
Most fluorite gemstones are cut from deeply colored stones, but they can also be cut from the less intensely colored materials. Fluorite is typically faceted as a gemstone only for collectors or display purposes. The most common shapes are traditional ovals, rounds and cushions, but fancier shapes can be found. Multicolored and banded fluorite is often shaped and polished as cabochons. Many collected fluorite stones are unworked and are traded in crystal form. Fluorite has a tendency to chip, and owing to its softness, gemstones must be cut very carefully.
Fluorite Treatment
Fluorite is typically unenhanced. However, some materials may have been enhanced through irradiation gamma rays to create interesting neon colors. Synthesized fluorite is also available in a variety of colors.