LOVELY OVAL CUT 6,35CT SONGEA (TANZANIA) GREEN BLUE SAPPHIRE GEMSTONE NATURAL GEMSTONE HEAT TREATED

A LOVELY 6,35CT (1,27G PLEASE SEE PHOTO MULTIPLY WEIGHT BY 5 TO GET CARATS) SONGEA (TANZANIA) BLUE SAPPHIRE GEMSTONE WITH A BEAUTIFUL OVAL CUT. COMES WITH A BEAUTIFUL PERSPEX PRESENTATION CASE AND VELVET BAG. MANY SONGEA GREEN SAPPHIRES SHOW A COMBINATION OF LIGHT BLUE AND GREEN THAT OFTEN LOOKS SLIGHTLY MORE BLUE OUTDOORS AND SLIGHTLY MORE GREEN INDOORS. (PLEASE SEE PHOTOS)
 
THIS PARTICULAR STONE WAS BOUGHT IN 2011 FROM A SELLER IN CHANTABURI THAILAND WITH THE ORIGEN OF THE STONE INDICATED AS SONGEA IN TANZANIA. IT HAS A VVS (EYE CLEAR) CLARITY WHICH MEANS IT IS FREE OF INCLUSIONS AS SEEN WITH THE NAKED EYE WHICH IT APPEARS TO BE. IT WAS ALSO SOLD AS A NATURAL BUT HEAT TREATED CEYLON BLUE SAPPHIRE GEMSTONE. IT IS HOWEVER A REAL (EITHER NATURAL OR SYNTHETIC) SAPPHIRE AS THE THERMAL CONDUCTIVITY TEST INDICATE IT SHOWS A HIGH THERMAL CONDUCTIVITY CHARACTERISTIC OF SAPPHIRE.
 
TESTS PERFORMED:
PASSED THE SCRATCH TEST: IT DID SCRATCH A GLASS WINDOW PANE WHICH WOULD INDICATE IT IS HARDER THAN GLASS. (MOHS HARDNESS GLASS 5.5-6.5 SAPPHIRE 9.0)
PASSED THE ELECTRON UV LIGHT EMISSION TEST: NO UV REACTION. NATURAL GREEN SAPPHIRES USUALLY SHOW NO UV AFFECT. A SYNTHETIC GREEN SAPPHIRE USUALLY SHOWS A WEAK ORANGE TO DULL BROWNISH RED FLUORESCENCE.
(THE UV LIGHT HIT THE ELECTRONS. THEY JUMP AND FALL BACK. THEY RADIATE LIGHT OF A CERTAIN WAVELENGTH WHEN THEY DO WHICH IS SPECIFIC TO EACH ELEMENT IN THE MINERAL. THIS IS CALLED FLUORESCENCE. ONLY 10% OF GEMSTONES EXHIBIT A FLUORESCENCE AFFECT LIKE RUBIES, SAPPHIRE, TOPAZ, OPALS AND DIAMONDS. GLASS AND ALL NATURAL QUARTZ VARIETIES DOES NOT SHOW A UV AFFECT.)
PASSED THE THERMAL CONDUCTIVITY TEST: TESTED THE THERMAL CONDUCTIVITY WITH A MIZAR PRESTIGE SERIES 2 DIAMOND TESTER. IT MOVED UP THE LADDER FROM STANDARD LEVEL 3 TO LEVEL 6. FOR SAPPHIRES AND RUBIES A LEVEL OF 6 TO 7 IS THE NORM FOR THIS TESTER.
(WITH THIS TESTER GLASS AND QUARTZ MAKES NO MOVEMENT.)
 
SIZE: 9.5mm x 11,3mm x 6,8mm
 
DISCLAIMER: I AM NO GEMSTONE EXPERT. THESE GEMSTONES BELONGED TO A FAMILY MEMBER THAT HAS PASSED AWAY. HE COLLECTED GEMSTONES DURING THE EARLY TWENTY FIRST CENTURY MANY WERE BOUGHT ON EBAY AND OTHERS BY TRAVELLING TO OTHER COUNTRIES. I HAVE TRIED TO VERIFY AS FAR AS POSSIBLE ANY STATEMENTS OR CLAIMS BY DOING SOME RESEARCH AND PRELIMARY TESTS ON EACH GEMSTONE.
 
SAPPHIRE:
Sapphire is one of the four precious gemstones amongst Rubies, Diamond and Emerald. Sapphire rank 9 on the Mohs scale of Hardness. Only a diamond can scratch sapphire.
Sapphire is a all the colours of the corundum mineral except red, which is the color of the ruby. Corundum is relatively common in nature, and is completely colourless. Small amounts of metallic elements such as Cr, Fe and Ti can substitute for aluminum in the structure, which gives rise to many colour variations.
Corundum once found wide application as an industrial abrasive like sandpaper. Gem corundum is mined almost exclusively from gem gravel deposits. Historically, the most famous and prolific production has been from Myanmar (Burma), Thailand, India and Sri Lanka (Ceylon). More recent important sources include East African countries of Madagascar, Tanzania and Mozambique.
Corundum was the first gem mineral to be synthesized in the lab by a process known today as flame fusion and flux growth. Synthetic rubies and sapphires are presently manufactured in enormous quantities for both industrial and gem application.This caused widespread apprehension and greatly diminished ruby sales. Extensive British ruby and sapphire mining operations in southeast Asia, particularly in Burma, suffered greatly from the resulting fall in prices.
The color and clarity of rubies and sapphires is commonly enhanced by heat treatment and, less frequently, by irradiation. Although not commonly disclosed by retailers, such processes are widely acknowledged within the industry and are probably today the rule rather than the exception. Reliably distinguishing among treated, untreated, natural and synthetic ruby and sapphire depends critically on microscopic examination.
Sapphires have been the darling gemstone of the royalty and Prince William proposed to Kate Middleton with his mothers 18 carat blue sapphire engagement ring.
 
PLEASE ALSO SEE MY OTHER ITEMS LISTED. I HAVE SOME OTHER GEMSTONES ALSO ON AUCTION THIS WEEK.