eBay

2.57 cts Very Rare Collectors Natural Oval-cut White IF Danburite (Mexico)

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 Danburite article below for your appreciation and enjoyment.

Summary from below: "By composition, danburite is a calcium boric silicate and although it is a relatively commonly occurring mineral, large and facetable gemstone quality material is considered especially rare. Today, danburite is one of the lesser-known gemstones and is primarily classified as a collector's gem." ... "Top grade danburite gemstones occur with excellent transparency and most form with very few inclusions. Eye-clean specimens should be expected, even in larger sizes. Danburite has a greasy to vitreous luster." ... "Danburite is not known to be treated or enhanced in any way. There are also no known synthetics or imitations available on the market."

Type: Ultra-Rare Natural Danburite (personally confirmed as Natural Danburite by digital refractometer (RI=1.635), dichroscope (dichroic), polariscope (four flashes in a rotation; not glass), spectroscope, UV short&long-wave light, measured Specific Gravity=3.01) -- captej2012

Color: White Transparent (brilliantly colorless and clear)
Shape: Oval-cut
Dimensions: 8.40mm x 7.50mm x 5.40mm
Weight: 2.57 cts
Luster: Top-Fire
Clarity: IF
Hardness: 7.0 rating on the Mohs Scale
Treatment: Not Heated, Not Enhanced, Not Treated
Origin: Mexico

Casper the Friendly Ghost -- A fitting name for a Rare and Elusive Gem!!

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

========================================================

Danburite Gemstone Information

About Danburite - History and Introduction

By composition, danburite is a calcium boric silicate and although it is a relatively commonly occurring mineral, large and facetable gemstone quality material is considered especially rare. Today, danburite is one of the lesser-known gemstones and is primarily classified as a collector's gem. It was officially named after the place in which it was first discovered in 1839 - Danbury, Connecticut (USA). Although Danbury is where the mineral was first found, the original mining deposit is now buried deep below the city, and surprisingly, the Danbury mineral deposit never actually yielded any gem quality specimens. The discovery of danburite is credited to Mr. Charles Upham Shephard (1804-1866), an eminent American mineralogist.

High quality danburite occurs with excellent transparency and clarity, and its hardness surpasses that of quartz. Its brilliance can rival that of the finest topaz, but owing to its modest ability to split light into spectral colors (dispersion), it lacks the fire required for most mainstream jewelry, which is the reason why danburite is sought-after by connoisseurs rather than jewelers.


	Natural Danburite

Identifying Danburite

Danburite can sometimes occur encrusted with quartz druzy, and in many cases, quartz may pseudomorph and replace danburite altogether. Danburite can be identified by its unique prismatic crystal structure and through its distinct chemical composition. In most cases, danburite can be easily distinguished from similar materials through its very specific gemological properties, particularly hardness, fluorescence, cleavage and specific gravity (density). Danburite has very little cleavage and a specific gravity roughly the same as jadeite. Danburite tends to be available in large sizes, which is rare with many other colorless gemstones. Colorless rock quartz and topaz are most often mistaken for danburite. However, but topaz is considerably harder than danburite, whilst quartz is slightly softer.

Danburite Origin and Gemstone Sources

Danburite was first discovered in Danbury, Connecticut (USA), but most of the danburite gemstones today originate from Mexico, specifically from Charcas, San Luis Potosi. Other notable gemstone quality deposits of danburite have been found in Bolivia, Burma, Japan, Madagascar and Russia.

Buying Danburite and Determining Danburite Gemstone Value

Danburite Color
Danburite can occur in a variety of colors ranging from colorless to very light-pink and from light-yellow to brown, but typically only colorless danburite is ever faceted as a gemstone.
Danburite Clarity and Luster
Top grade danburite gemstones occur with excellent transparency and most form with very few inclusions. Eye-clean specimens should be expected, even in larger sizes. Danburite has a greasy to vitreous luster.
Danburite Cut and Shape
Danburite is almost always faceted, but for collectors rather than for jewelry designers. Danburite is occasionally diamond-cut to be used as diamond alternatives. The most common shapes are ovals, since they preserve the most original rough carat weight. Other shapes such as cushions, rounds, trillions, octagons (emerald-cuts) and pears are quite common.
Danburite Treatment
Danburite is not known to be treated or enhanced in any way. There are also no known synthetics or imitations available on the market.