1.91CT COLLECTORS GEM BRAZILIAN VIOLET DUMORTIERITE CRYSTALS IN QUARTZ CABOCHON

Description

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We specialize in collector & high end colored gems not commonly found in retail stores. We strive to provide the best possible customer service and value. We stand behind our products and have the expertise of a GIA Graduate Gemologist to serve you.
Donald Hofler GIA GG, AJP
SEE OUR GROWING SELECTION OF SOME OF THE RAREST GEM STONES AND MINERALS ON EARTH IN OUR STORE. WE OFFER WELL OVER 100 DIFFERENT GEMS, MINERAL, SPECIES AND VARIETIES FOR SALE AND AUCTION AND OUR SELECTION IS GROWING. TAKE A PEAK AND IF YOU HAVE ANY QUESTIONS PLEASE ASK.
Pieces: 1
Shape: Oval Cabochon
Type:
Dumortierite
Quartz
Color:
Dumortierite
crystals in clear Quartz
Weight: 1.91 CT
Clarity: Si1-2 (Type II)
(
PLEASE; If unsure of what clarity means see chart below for a more detailed explanation also remember colored gems are graded with the naked eye and not a loupe
)
Size:  9.3 x 6.5 x 4.5 mm
Luster: Vitreous
Origin:  Brazil
Treatment: None
Hardness: 7.0 on MOHS
Dumortierite
is a fibrous variably colored aluminum boro-silicate mineral, Al7BO3(SiO4)3O3. Dumortierite crystallizes in the orthorhombic system typically forming fibrous aggregates of slender prismatic crystals. The crystals are vitreous and vary in color from brown, blue, and green to more rare violet and pink. Substitution of iron and other tri-valent elements for aluminum result in the color variations. It has a Mohs hardness of 7 and a specific gravity of 3.3 to 3.4. Crystals show pleochroism from red to blue to violet. Dumortierite quartz is blue colored quartz containing abundant Dumortierite inclusions. Dumortierite was first described in 1881 for an occurrence in Chaponost, in the Rhône-Alps of France and named for the French paleontologist Eugène Dumortier (1803–1873). It typically occurs in high temperature aluminum rich regional metamorphic rocks, those resulting from contact metamorphism and also in boron rich pegmatites. The most extensive investigation on Dumortierite was done on samples from the high grade metamorphic Gfohl unit in Austria by Fuchs et al. (2005).It is used in the manufacture of high grade porcelain. It is sometimes mistaken for sodalite and has been used as imitation lapis lazuli.
PICTURES; I AM A GRADUATE GEMOLOGIST WITH LIMITED PHOTOGRAPHY SKILLS. WHILE MY GEM & GEM TREATMENT SKILLS ARE VAST MY PHOTOGRAPH SKILLS ARE NOT. ONE NEEDS TO MAKE A CHOICE, BUY YOUR RARE GEMS AND JEWELRY FROM A GEMOLOGIST WHO CAN ASSURE THT WHAT YOU ARE BUYING IS WHAT YOU ARE BUYING OR A PHOTOGRAPHER WHO TAKES GREAT PHOTOS AND MAY NOT GET THE GEM CALL CORRECT. AS FAR AS ADDITIONAL PHOTOS, THAT TYPICALLY WILL NOT HAPPEN, SORRY. I RARELY GET THE TIME TO TAKE PHOTOS WHEN I GET MY SET UP AND RUNNING SO ASKING FOR SPECIAL OR ADDITIONAL PHOTOS WILL GET A HONEST
RESPONSE, BUT, NOT LIKELY THE ONE YOUR LOOKING FOR SO IF THE ONE PHOTO YOU NEED TO PURCHASE MY ONE OF A KIND ITEM IS NOT THERE YOU MIGHT HAVE TO CONSIDER ANOTHER SELLER THAT CAN PROVIDE YOU THE PHOTO YOU NEED OR TRY IT ON YOUR OWN HAND WHEN IT ARRIVES.
​THANKS IN ADVANCE, DON HOFLER GIA GG, AJP
VVS 1 & 2
Extra Fine Quality. These gems have microscopic inclusions which are difficult to slightly difficult to see under a loupe with 10x magnification.
VS 1
Very Fine Quality. Small pin-pricks are just visible to the scrutiny of the close naked eye. However, the beauty of the gem is not diminished in anyway.
VS 2
Fine Quality. Small pin-pricks and feathers are just visible to the scrutiny of the close naked eye. However, the overall beauty of the gem is still not diminished.
SI 1
Good Quality. These gems have inclusions, which are fairly easy to see to the close naked eye. However, the overall beauty of the gem is still high.
SI 2
Good to Medium-High Quality. These gems have inclusions which are fairly easy to see under the close naked eye. These inclusions are usually not really visible at an arm's length.
Included
Medium to the lower qualities. Included gems with internal features that range from eye visible to very easily seen to the naked eye.
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