GISA CERTIFIED 1,35CT BLUISH VIOLET TANZANITE GEMSTONE FROM THE SLOPES OF KILIMANJARO

A LOVELY 1,35CT (0,27G PLEASE SEE PHOTO MULTIPLY BY 5 TO GET CARATS) BLUE TANZANITE GEMSTONE WITH A BEAUTIFUL OVAL CUT. COMES WITH ASMALL PERSPEX PRESENTATION CASE AND SUPPLIED GISA CERTIFICATE.
 
THE FOUR BLUE FACETED GEMSTONES THAT ARE MOST OFTEN SEEN IN COMMERCIAL JEWELRY ARE IN ORDER OF HOW EXSPENSIVE THEY ARE: TOPAZ, AQUAMARINE, TANZANITE AND SAPPHIRE. 
 
NOTE THIS WEEK I HAVE 2 TANZANITES ON AUCTION. BESIDES THIS BEAUTY I HAVE A 3,05CT ROUND CUT TANZANITE GEMSTONE ALSO ON AUCTION. ALL MY AUCTIONS END AT 22H30 SO IT IS ADVISABLE TO PUT IN AN AUTOMATIC BID (HIGHEST PRICE YOU ARE WILLING TO PAY) EARLY.
 
THIS PARTICULAR STONE WAS BOUGHT IN 2011 FROM A SELLER IN CHANTHABURI THAILAND WITH THE ORIGEN OF THE STONE INDICATED AS TANZANIA. IT HAS A SI2 (INCLUSIONS EYE VISIBLE) CLARITY WHICH MEANS IT HAS SOME INCLUSIONS AS SEEN WITH THE NAKED EYE WHICH IT APPEARS TO BE. WAS ALSO SOLD AS A NATURAL AND UNHEATED GEMSTONE. THE TESTS I WAS ABLE TO PERFORM COULD NOT DISPROVE THIS STATEMENT BUT NEITHER COULD IT PROVE IT.
 
THIS TANZANITE GEMSTONE HAS A SUPPLIED GISA (GEMMOLOGY INSTITUTE OF SOUTHERN AFRICA) CERTIFICATE. THIS COMPANY DOES NOT HAVE A GOOD REPUTATION ONLINE. THEY COULD NOT BE CONTACTED BY CONTACT DETAILS SUPPLIED ON THE BACK. THERE IS NO WEBSITE TO CHECK PAST REPORTS THAT I COULD FIND. I DO NOT KNOW IF STILL IN EXISTENCE. TO THEIR CREDIT THOUGH I HAVE SEEN CERTIFICATES BY THEM THAT I COULD INDEPENDENTLY VERIFY AS CORRECT.
 
IT PASSED OR GAVE AN UNCLEAR ON ALL THE TESTS I COULD PERFORM:
UNCLEAR SCRATCH TEST: I WAS NOT ABLE TO TEST ACCURATELY SINCE THE STONE IS TOO SMALL FOR MY BIG FINGERS. I DO NOT KNOW IF IT SCRATCHES GLASS.
TANZANITE CAN SCRATCH A WINDOW PANE. 
(MOHS HARDNESS GLASS 5.5-6.5 TANZANITE 6.5-7.0 QUARTZ 7.0-7.5)
PASSED ELECTRON UV LIGHT EMISSION TEST: NO UV REACTION AS IT SHOULD BE. AS A SILICATE MINERAL TANZANITE SHOWS NO FLUORENCENT REACTION IT IS INERT. GLASS AND ALL QUARTZ VARIETIES ALSO DOES NOT SHOW A UV AFFECT.
(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 THERMAL CONDUCTIVITY TEST: TESTED THE THERMAL CONDUCTIVITY WITH A MIZAR PRESTIGE SERIES 2 DIAMOND TESTER. IT DID NOT MOVE UPTHE LADDER A LITTLE FROM STANDARD LEVEL 3. TANZANITE (ZOISITE) IS A SILICATE MINERAL WITH A THERMAL CONDUCTIVITY OF ONLY 0,005 AND A LEVEL OF 3 IS THE NORM FOR THIS TESTER.
(WITH THIS TESTER GLASS MAKES NO MOVEMENT. QUARTZ WITH A THERMAL CONDUCTIVITY OF AROUND 0,02 NORMALLY GOES TO LEVEL 4 ON THE MIZAR TESTER)
 
SIZE: 8,0mm x 6,0mm x 4,0mm
 
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 ANYSTATEMENTS OR CLAIMS BY DOING SOME RESEARCH AND PRELIMARY TESTS ON EACH GEMSTONE.
 
TANZANITE:
Tanzanite is the blue and violet variety of the mineral zoisite, caused by small amounts of vanadium. It is classified as a silicate. The extraordinary gemstone was first discovered in 1967 at the foothills of Mount Kilimanjaro the only known source in the world. All of the known deposits are confined to a few square miles of land in northern Tanzania.
The mineral zoisite naturally occurs in a wide range of colors that include colorless, gray, yellow, brown, pink, green, blue, and violet. The name "tanzanite" is used for a color variety of zoisite that ranges from blue, through violet, to violish purple.
HEAT TREATMENT IS DONE TO ALMOST ALL OF THE TANZANITE ON THE MARKET TODAY TO IMPROVE THE COLOR. SCIENTISTS FOUND THAT HEATING COULD CONVERT SOME NATURALLY BROWN OR GREEN ZOISITE INTO BEAUTIFUL BLUE ZOISITE(TANZANITE!). WITH THE EXCEPTION OF A SMALL AMOUNT OF NATURALLY BLUE MATERIAL, HEATING IS THE SOURCE OF TANZANITE'S DESIRABLE BLUE COLOR. 
Tanzanite is one of the most sought-after gemstones of all time. According to a Tanzanian geologist, the circumstances that led to its formation 585 million years ago were so exceptional that the likelihood of finding tanzanite anywhere else on earth is one in a million, making it a thousand times rarer than diamonds.
With only one known source in the world, tanzanite is predicted to be depleted within 10-12 years. 
 
NATURAL, SYNTHETIC OR FAKE?
There is no synthetic for tanzanite like in synthetic sapphires, ruby and emeralds. Only imitations can be a problem and they can include glass, synthetic quartz, synthetic spinel, synthetic sapphire etc.
 
PLEASE ALSO SEE MY OTHER ITEMS LISTED. I HAVE VARIOUS OTHER GEMSTONES ALSO ON AUCTION THIS WEEK. COPY THE URL UNDERNEATH AND PASTE INTO GOOGLE AND IT WILL TAKE YOU DIRECTLY TO ALL MY LISTINGS THIS WEEK.
https://www.bidorbuy.co.za/seller/3685641/ErnRex1545