The Black Star of Queensland - Famous Black Sapphire Gemstone

Nadeem
July 30, 2009 at 3:46 pm
Someone sent me a test report from Dubai for 3 Star Sapphire stones, 1 Blue (204 Carat) one Black (120 Carat) one black again (50 carat). is it really possible to have such stones. If yes, what may be the estimated value of such stones ?

Coco Renaud
September 27, 2009 at 5:54 pm
I know a man named Jack, who says he was the owner of the big black stone and that Harry Winston kept it from him. He eventually settled with Winston. But I’m not sure what the settlement was for. He went on to purchase Liz Taylor's old house in the Calif. desert. Just wondering if you could verify the price the stone finally went for.

Coco Renaud
September 27, 2009 at 5:57 pm
I heard that the big black stone was finally transferred to Winston. Can you find out what the settlement was?
My friend Jack was a co-owner. Just wondering the ‘worth” today. Winston was keeping it hostage and finally got it. For a pretty price i’m sure.
Thanks.

sammy
January 10, 2010 at 7:25 pm
What will be the price of a 120 ct natural black star sapphire? Thank you.

jo woods
January 20, 2010 at 6:58 am
Hi there! A friend of mine just had a star sapphire cut. It is about 25 carats. It has 2 perfect stars on it, one bronze and the other blue, directly sitting on top of each other, like a 12 point star, one leg of star blue, the next bronze etc.. He has been told that this is a very rare, maybe priceless stone. Hope this makes sense. Can't find any info at all. What do you think about this rare gemstone, without having the opportunity of seeing it ? Can you help ?

victor
April 10, 2012 at 5:28 pm
I have a very large piece of raw black star saphire. It weighs about 16 oz and is about the size of the palm of my hand. I am interested in knowing more about it and I am also wondering if you buy stones.
Thank you
Victor

micheal
July 19, 2012 at 1:37 am
I have a very large black stone that I found on the side of a creek bed near Emerald Qld just after the 2010/2011 floods. It is still surrounded by what I think is some sort of opal and clay and dirt. Any ideas on who I could contact to get more info about this rock?

The following is an image of some Black Star Sapphires exhibited at the FACETS-2010 Exhibition, held in September 2010, in Sri Lanka :-

I came across the following natural black/grey star sapphires of extraordinary size and quality, with perfect radiating stars and mounted on exquisitely crafted, stunning designer jewelry, offered for sale at The Star Ruby Shop, the renowned online shopping site, with the web address www.starruby.in/store/ .The black star sapphires appear to be of Indian origin. The cabochon-cut of the star sapphires are indeed splendid with the radiating stars perfectly centered :-
1) A 35.44-carat black star sapphire mounted as the centerpiece of a unique pendant, also incorporating 0.61 carats of diamonds.
2) A 15.06-carat black star sapphire mounted as the centerpiece of a 10K yellow gold, Solid Men's Ring, with the gold weighing 10.02 grams.
3) A 55.70-carat black/grey star sapphire mounted as the centerpiece of a 10K white gold, one-of-a-kind pendant, with the gold weighing 11.13 grams.
The above images were taken from the following webpage :- http://www.starruby.in/store/custom-jewelry-solutions
Hope this information would be stimulating for the on-going discussion and also useful for your readers.

Thank you Diamanta, for your contribution. The images you have uploaded are indeed stunning and hopefully useful for all participants in this forum.

Thanks for your information Diamanta. I too came across images of some stunning black star sapphires set in some exquisitely crafted pieces of jewelry at the online shopping portal http://www.mineralminers.com .
1) A 11.01-carat natural black star sapphire of Indian origin, set in a handcrafted 14K white-gold pendant, price marked USD 1,231.25.
2) A 9.80-carat natural black star sapphire set in a 14K yellow-gold ring, price marked USD 1,131.25.

Please click the following link to visit this webpage http://www.mineralminers.com/html/sbkjlry.stm

A stunning range of black star sapphires, of Thailand origin, some extremely rare, can be seen at the online shopping portal of the renowned Bangkok-based gem company AJS Gems.
Here are some examples of these black beauties :-
1) An extremely rare, 28.96-carat, cabochon-cut, oval-shaped, 12-rayed, black star sapphire of Thailand origin moderately price marked USD 1,200.00
2) A rare, 28.79-carat, cabochon-cut, roundish-oval, 12-rayed, black star sapphire of Thailand origin, with six distinct and six lighter rays alternating with one another, and moderately price marked USD 1,145.00
3) A 19.53-carat, cabochon-cut-oval-shaped, 6-rayed, black star sapphire of Thailand origin, with thin very distinct rays, price marked USD 765.00
4) A 3.72-carat, cabochon-cut, 6-rayed, black star sapphire of Thailand origin, with a rare unconventional pear-shape, price marked USD 95.00
Please click the following link to visit AJS Gems webpage on Black Star Sapphires - http://www.ajsgem.com/black-star-sapphire-gemstone-sapphire-2046340411.html

Wow Mary !!! Your images are indeed stunning and informative. I have seen 12-rayed blue star sapphires before. Honestly, this is the first time I am seeing a 12-rayed black star sapphire. Hoping for more useful contributions from you in the future.

Thanks Mary for your contribution. The images you uploaded not only show distinct rays, but also bundles of rutile/haematite fibres/platelets laid down in hexagonal pattern, that are responsible for the play of light, known as the "star effect" or asterism.

What actually causes the black color in black star sapphires ?

Sapphire is crystalline Aluminium Oxide (Al2O3)known as Corundum, the second hardest on the Mohs scale after diamond. Sapphires crystallize in the trigonal crystal system, forming crystals that are hexagonal elongate prisms. Pure sapphires made of Aluminium Oxide only are white in color. However, if some of the Aluminium atoms in the crystal lattice of Aluminium Oxide are displaced by atoms of transition elements, various colored forms of sapphire are produced, such as titanium and iron causing different shades of blue; vanadium causing purple color; iron causing yellow and green; nickel causing green; iron and vanadium causing orange; chromium and iron causing the pinkish orange of Padparadscha Sapphire. In the case of black sapphire however, no transition element is responsible for the black color. The black color is caused by the incorporation of the mineral impurity Haematite (Iron III Oxide - Fe2O3) in the crystal structure of Aluminium Oxide. Haematite is a black or grayish mineral, forming small platelets or fibers, that exist as inclusions in the sapphire.
Star Sapphire is asteriated Corundum. The star effect known as "asterism" is produced by bundles of rutile fibers (Titanium Oxide) aligned in a three-fold pattern inside the stone, reflecting the light entering the stone from its dome-shaped face into the six-rayed star pattern. The milkiness of the sapphire known as "silk" is also caused by rutile fibers. In the case of black star sapphires, the star effect is produced by bundles of Haematite platelets or fibres aligned in a three-fold pattern inside the stone. Rutile fibers may also be found in black star sapphires in combination with the haematite fibers, and may contribute to the asterism. Hence, in black star sapphires both the color of the sapphires and asterism are caused mainly by one inclusion, viz. Haematite platelets or fibers.