1,27 ct naturel non chauffé coupé coussin multicolore/marron SI andulasite (Brésil)

EUR 94,26 Achat immédiat ou Offre directe, Cliquez pour voir les frais d'expédition, 30-Jour Retours, Garantie client eBay
Vendeur: captej2012 ✉️ (874) 100%, Lieu où se trouve: Canyon Country, California, US, Lieu de livraison: WORLDWIDE et de nombreux autres pays, Numéro de l'objet: 271967770152 1,27 ct naturel non chauffé coupé coussin multicolore/marron SI andulasite (Brésil).

1.27ct Natural Cushion-cut Multi-Color/Brown VS Andulasite (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 an Andulasite reference below for your appreciation and enjoyment.

Summary from below:  "Andalusite is a strikingly beautiful gem, but it is largely unknown to the general public and considered to be one of the lesser-known gem types in the trade."   ...   "Andalusite has a very distinct combination of colors, and a very pronounced level of pleochroism, which results in the exhibition of different colors when viewed from different angles. Andalusite most often occurs translucent to opaque, with transparent gemstone-quality specimens being very rare."   ...   "For many years, andalusite has primarily been a collector's stone, but it has recently gained a lot of attention from many jewelry designers. It is becoming increasingly popular in jewelry designs."   ...   "Andalusite possesses a good level of durability and hardness, making it suitable for any type of jewelry application. The attraction of andalusite is greatly owed to its play of color, which can be seen during changes in its viewing angle. Similar effects are also seen when lighting strikes the gem from different directions."   ...   "Andalusite is typically untreated. There are no known typical enhancements for transparent specimens."

Type:  Natural Andulasite  (personally confirmed as genuine Andulasite by digital refractometer (RI=1.630), dichroscope, polariscope, spectroscope, UV short&long-wave light, measured Specific Gravity=3.04) -- captej2012

Color:  Multi-color/Brown (highly-pronounced pleochroism) Shape:  Cushion-cut Dimensions:  6.28mm x 6.01mm x 4.07mm Weight:  1.27 ct Luster:  TopFire Clarity:  SI Hardness:  7.0-7.5 rating on the Mohs Scale Treatment:  Not Heated, Not Treated, Not Enhanced Origin:  Brazil

She came as an infant, moody and maddeningly fickle.

We never knew what would set her towards Any of Several Colors.

Howsoever dynamic though, she is beautiful for it.

But now, she bristles and brays with boredom.

 

She's matured beyond the Elderly Two-of-Us.

We understand and will send her to who will love her away.

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

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Andalusite Gemstone Information About Andalusite - History and Introduction

Andalusite is named after Andalusia, the Spanish autonomous community where it was first discovered. Andalusite is an aluminum silicate, closely related to both silimanite and kyanite. In fact, all three minerals are polymorphs, which means they share the same chemical composition, but possess different crystal structures. Andalusite is a strikingly beautiful gem, but it is largely unknown to the general public and considered to be one of the lesser-known gem types in the trade.

Andalusite has a very distinct combination of colors, and a very pronounced level of pleochroism, which results in the exhibition of different colors when viewed from different angles. Andalusite most often occurs translucent to opaque, with transparent gemstone-quality specimens being very rare. For many years, andalusite has primarily been a collector's stone, but it has recently gained a lot of attention from many jewelry designers. It is becoming increasingly popular in jewelry designs. Andalusite possesses a good level of durability and hardness, making it suitable for any type of jewelry application. The attraction of andalusite is greatly owed to its play of color, which can be seen during changes in its viewing angle. Similar effects are also seen when lighting strikes the gem from different directions.

 

Natural Andalusite Gemstone
Identifying Andalusite

There are only a few gem types that could be mistaken for andalusite, including tourmaline, chrysoberyl, sphene, smoky quartz and idocrase. Pleochroism in gems occurs in varying strengths; weak, distinct or strong. Pleochroic effects are the result of differing absorption of light rays, and the phenomenon can only occur with doubly refractive crystals. Andalusite is considered to be strongly pleochroic, along with iolite, kyanite, kunzite, sphene and tanzanite. Andalusite has trichroic pleochroism; when light enters the stone, it is parted into three sections, each containing a portion of the visible spectrum. Some pleochroic gems, such as kunzite, possess dichroic pleochroism, which means that they display only two different colors.

 

Andalusite Origin and Gemstone Sources

Andalusite typically occurs in placers, gneisses, and schists as a result of argillaceous sediment that has been metamorphosed. Andalusite rarely occurs in granite or pegmatites, but it does, it tends to yield the largest crystals. Andalusite deposits can be found in many locations, including Australia, Brazil, Canada, Russia, Spain (Andalusia), Sri Lanka, Burma, Madagascar and the USA (California and Colorado).

Buying Andalusite and Determining Andalusite Gemstone Value

Andalusite Color

Andalusite colors depend on the orientation of the crystal, but they typically occur yellow, yellow-green, green, brownish red, olive and reddish brown. Each gemstone possesses two colors that differ in intensity, and often the colors blend together, especially with square and round shapes. Shapes with a long axis, such as oval, pear, marquise or emerald cuts, tend to show one color near the center and a second, usually darker color toward the ends of the crystal. Typically, when cutting pleochroic gems, cutters attempt to minimize pleochroism and maximize one desirable color. However, with andalusite, cutters do the exact opposite and try to orient the gem to result in a pleasing mix of colors, such as orangey-brown and yellowish-green or gold.

Andalusite Clarity and Luster

Andalusite typically occurs translucent to opaque. Opaque specimens are known as chiastolite. Dark inclusions in chiastolite produce cruciform-like shapes within the stones and these are often referred to as 'Cross Stones'. Chiastolite usually occurs white, gray or yellowish and is rather soft (5 - 5.5 on the Mohs scale) compared to transparent andalusite. Transparent andalusite is quite rare and only a small percentage of yield is of gemstone quality. Most specimens contain some inclusions, with the most common being rutile needles. When polished, andalusite has a vitreous to matte luster.

Andalusite Cut and Shape

Transparent andalusite is almost always table faceted with brilliant cuts. Andalusite is very rarely cut en cabochon, with exception to opaque varieties. Andalusite color is greatly enhanced by specific orientation and cutting. Without proper cutting, andalusite would not display its desirable pleochroic shades of brown, green and reddish-brown. Oval, marquise and emerald cuts are very popular, due to their long axes. Square and round cuts are also popular because they will have an attractive mosaic-like blend of colors. Since andalusite is one of the lesser-known gemstones, trillion, heart and other fancy shapes are not very common because there is little demand for them.

Andalusite Treatment

Andalusite is typically untreated. There are no known typical enhancements for transparent specimens. Some opaque varieties (chiastolite) may be heat treated or resin-filled to enhance clarity, but this is rare. Some Brazilian material is known to change from olive-green to pinkish when heated and some brown specimens can fade to colorless when heated above 800°C. Irradiation treatment is thought to be able to reverse heat treatment results, but in any case, ehancements should be disclosed by all gemstone suppliers.

  • Condition: Neuf sans emballage
  • Condition: "Andalusite is a strikingly beautiful gem, but it is largely unknown to the general public and considered to be one of the lesser-known gem types in the trade." ... "Andalusite has a very distinct combination of colors, and a very pronounced level of pleochroism, which results in the exhibition of different colors when viewed from different angles." ... "Andalusite possesses a good level of durability and hardness, making it suitable for any type of jewelry application. The attraction of andalusite is greatly owed to its play of color, which can be seen during changes in its viewing angle. Similar effects are also seen when lighting strikes the gem from different directions." ... "Andalusite is typically untreated. There are no known typical enhancements for transparent specimens."
  • Total Carat Weight (TCW): 1.27 ct
  • Natural/Lab-Created: Natural
  • Color: Multi-Color/Brown
  • Shape: Cushion
  • Treatment: Not Heated
  • Country/Region of Manufacture: Brazil
  • Gemstone: Andulasite
  • Country of Origin: Brazil
  • Length: 6.28mm
  • Width: 6.01mm
  • Depth: 4.07mm
  • Transparency: SI

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