Jewelry Gems and Rare Stones for Gemologists

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Welcome to 1001Rare Gem Stone News Letter August 23th 2011. Today thing are moving fast my new stocks or rare stone is superb i have over 200 different Types of Gemstone from around the world new gallery’s are just going up on the home page it will take only one week
When there more that 3000 gems stone you do not know were to start
So my wife a FGA & Rayner Price 1963 Margaret Davis said it would be better to show 300 gems at the same time so you can 
Decide what you like to buy
This is what I have just made on my home page if you start here you will find lots of affordable stones there is fifty different gems stone on each of the six section as below

Gemstone offer #1,    
Gemstone offer #2,   
Gemstone offer #3
Gemstone offer #4,   
Gemstone offer #5,   
Gemstone offer #6 
To help you with the information I have a link to “The Definitive Gem List
http://www.1001raregemstones.com/gemtable.html
I also made a Gemway Map to show you the different stone in color order that I have in hand http://www.1001raregemstones.com/gemway.asp
Hope you enjoy look at these superb stone a great number of Gems are affordable

Next you may like to save money on Testing Equipment
I offering a collection of gem stone with each item purchased
http://www.1001raregemstones.com/gem_testing_instruments.asp

Regards
M  Davis F.G.A.

Gem Refractometer FGR-003 Hard CZ measuring prism. Scale range: 1.35-1.85.Accuracy: ±0.003 Professional optical design. Aluminum alloy table. Internally installed the monochromatic light. There are two ways of inputting the voltage:7v batteries and DC3V direct current supply(AC100-240V).2ml refringent oil(1.78±0.005) with unique design of the bottle(Proprietary technology ZL200620096730.7),It is much safer ,much economical and more convenient.

As an opening offer on my new web site 1001raregemstones.com buy $125 or more in rare stones and get a $35 rebate towards the cost of a Gem Refractometer FGR - 0003 This superb Refractometer is yours for only $200

Gem Refractometer FGR-003

Count Richard Taaffe (1898-1967), an Irish gemologist, was the discoverer of taaffeite in 1945. This is truly the rarest and most important discovery of its time. The original stone found was only 0.77 cts. Count Taaffe, a Dublin gemologist, came across a pale mauve cut stone whtch had most of the characteristics of spinel but which showed distinct signs of double refraction. Investigation showed that the stone was a completely new mineral. This was followed by the finding of a second cut stone in 1949. Taaffeite is a beryllium magnesium aluminate (BeMgAl16O32) , and seems to be the only known mineral including both beryllium and magnesium as essential constituents. The chemical composition indicates that the stone is intermediate between spinel and chrysoberyl. The system of crystallization is hexagonal. The hardness is 8 on Mohs scale: The hardness is 8 -8.5: the density is from 3.60 to 3.61 and the indices of refraction vary from 1.721 to 1.723 for the ordinary ray and from 1.717 to 1.718 for the extraordinary ray, the mineral having the small negative uniaxial birefringence of 0.004. The stone was too pale for the dichroism to be observed and the same reasoning applies to the absorption spectrum. However, in the original stone found by Count Taaffe, a vague band in the blue was observed very near to and exactly like the band shown in the blue spinel. A band due to ferrous iron, at 4580 ? the fluorescence shown by these is stones under ultra- violet light, is a distinct green and this is more pronounced under x-rays. It has a luminescent glow similar to that shown by pale mauve spinels. The location of the original taaffeite is unknown but the stones are believed to come from Ceylon, since other stones have been found in Ceylon (now known as Sri Lanka).

During 1957 a deep garnet-red crystal emanating from the Mogok gravels at Ohngaing village, Upper Burma, was identified as a new mineral, a mineral which could be cut as a gemstone. There may, therefore, be cut gemstones in existence which at present are unidentified. Painite, a calcium boro-silico aluminate, belongs to the hexagonal crystal system. The hardness of the mineral is 7½ on the Mohs scale and the density is 4.01. The refractive indices are for ordinary rays 1.816 and for the extraordinary rays 1.787; the mineral is therefore uniaxial. The colours are ruby-red and pale brownish orange, the deeper colour being that of the ordinary ray. The absorption spectrum shows a faint chromium spectrum. The original specimen showed a red colour under crossed filters, a weak red glow under long-wave ultraviolet light and a stronger red glow under the short-wave lamp. Under x-ray the glow was a very dim bluish-yellow. The crystal showed featherlike sheets of minute cavities and inclusions of a large hexagonal tabular crystal. This mineral was named after A.C.D. Pain, who found the crystal about 1951.

Not too long ago, we examined in the New York laboratory a rough specimen of banded, translucent, and brownish to green material that we tentatively identified as common opal, with no play of color. Later, we were allowed to examine and photograph a 1.5-ct chatoyant orange-brown cabochon, said to have been cut from a clear band of this material. Testing by X-ray diffraction in the Santa Monica lab established the presence of cristobalite. A diffraction pattern superimposed on an amorphous background indicates that the material is opal. This is the first cat’s-eye opal of this type seen by the lab. Opal with true chatoyancy Dr. Byron C. Butler of World Gems/G.S.G. in Scottsdale, Arizona, provided the Gem News editors with a very unusual 0.76-ct cat’s-eye opal for investigation. The opal, a translucent oval single cabochon, measures 7.33 x 5.47 x 3.31 mm and has a brownish yellow body color. Unlike most so-called cat’s-eye opals, which exhibit chatoyancy as a band of play-of-color when fashioned as triplets, this unassembled gem exhibits true chatoyancy. As in fine cat’s-eye chrysoberyl, the “eye” is very sharp, and the stone also exhibits a strong “milk-and-honey” effect when the cabochon is illuminated from the side at a right angle to the chatoyant band. The R.I., taken both on the well-polished base and by the spot method, was 1.45. When examined between crossed polars, the opal exhibited an anomalous blinking reaction in the form of a strain-induced snake-like band along the length of the dome. The stone fluoresced a weak red to both long- and short-wave U.V. radiation, and appeared a grayish bluish green through the Chelsea color filter. S.G. was determined by hydrostatic weighing to be approximately 2.08. Magnification revealed an extremely fine fibrous structure plus minute black inclusions. The most unusual feature of this chatoyant opal was what appeared to be weak pleochroism in yellow and brownish orange that was noted with a calcite dichroscope. It is possible that this opal formed as a pseudomorph after a doubly refractive fibrous mineral such as goethite (which might also be responsible for the color) and that like-oriented remnants of the original material are responsible for both the strain and the apparent pleochroic reaction in this essentially amorphous material. Opal that was described by R. A. Ball in the Australian Gemmologist (November, 1982) as “honey-coloured, translucent to clear and resinous to glassy in appearance,” found both with and without play of color. Honey opal has been found in both sedimentary and volcanic rocks in Australia Max Davis has the world largest known cat’s eye honey opal: weight 4.34 cts, size 12 x 10 mm.