AWESOME LARGE 74,55CT BROWNISH ORANGE IMPERIAL TOPAZ GEMSTONE WITH OVAL CUT AND SUPPLIED GISA CERTIFICATE

AN AWESOME LARGE 74,55CT (14,91G PLEASE SEE PHOTO MULTIPLY WEIGHT WITH 5 TO GET CARATS) BROWNISH ORANGE IMPERIAL TOPAZ GEMSTONE WITH A BEAUTIFUL BEAUTIFUL OVAL CUT. COMES WITH A BEAUTIFUL PERSPEX PRESENTATION CASE AND SUPPLIED GISA CERTIFICATE.
 
THIS LARGE STONE HAS ONE SMALL SCRAPE AT THE BACK AND TWO PINPRICK SCRAPES ON THE GEM FACE SIDE (PLEASE SEE PHOTOS). IT IS OVERALL STILL IN VERY GOOD CONDITION FOR SUCH A LARGE STONE.
 
THIS PARTICULAR STONE WAS BOUGHT INN 2011 FROM A SELLER IN ISLAMABAD PAKISTAN WITH THE ORIGEN OF THE STONE INDICATED AS AFGHANISTAN. IT HAS A SI1 (INCLUSIONS VISIBLE) CLARITY WHICH MEANS IT HAS INCLUSIONS AS SEEN WITH THE NAKED EYE WHICH IT APPEARS TO BE. IT WAS ALSO SOLD AS A NATURAL UNTREATED IMPERIAL TOPAZ GEMSTONE.
 
I THINK IT MIGHT WELL BE A NATURAL GEMSTONE THAT HAS BEEN HEAT TREATED THOUGH. I SAY THIS FIRSTLY SINCE NATURAL TOPAZ IS FOUND AS CRYSTALS THAT ARE CONSIDERABLY LARGER THAN THOSE OF MANY OTHER PRECIOUS STONES. CONSEQUENTLY, ITS PER-CARAT PRICE DOES NOT RISE MUCH AS THE SIZE OF THE GEM INCREASES. HOWEVER COMMON TOPAZ IN ITS NATURAL STATE IS COLORLESS, THOUGH TRACE ELEMENT IMPURITIES CAN IN RARE INSTANCES MAKE IT PALE BLUE OR GOLDEN BROWN TO YELLOW ORANGE. TOPAZ IS OFTEN TREATED WITH HEAT OR RADIATION TO MAKE IT A DEEP BLUE, REDDISH-ORANGE, PALE GREEN, PINK, OR EVEN PURPLE.
 
TESTS PERFORMED:
PASSED SCRATCH TEST: IT DID SCRATCH A GLASS WINDOW PANE EASILY WHICH WOULD INDICATE IT IS HARDER THAN GLASS. (MOHS HARDNESS GLASS 5.5-6.5 TOPAZ 8.0)
PASSED UV LIGHT TEST: NO UV REACTION.
EXSPECTED UV REACTION IS NO TO WEAK FOR TOPAZ IN GENERAL. NATURAL SHERRY-BROWN, PINK, OR GOLDEN YELLOW TOPAZ MAY SHOW A WEAK TO STRONG ORANGE-YELLOW 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 5. FOR TOPAZ A LEVEL OF 5 TO 6 IS THE NORM FOR THIS TESTER.
(WITH THIS TESTER GLASS NO MOVEMENT AND QUARTZ ONLY MOVE UP LITTLE TO NO 4.)
 
THIS TOPAZ GEMSTONE HAS A SUPPLIED GISA (GEMMOLOGY INSTITUTE OF SOUTHERN AFRICA) CERTIFICATE. THIS COMPANY DOES NOT APPEAR TO 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 REPORTS BY THEM WHERE THEY BY MY OWN CONFIRMATION HAVE NOT EXAGERATED OR LIED ABOUT A STONE.
 
SIZE: 29,51mm x 22,37mm x 13,70mm
 
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 THOROUGH RESEARCH AND PRELIMERARY TESTS ON EACH GEMSTONE.
 
TOPAZ:
Topaz is a semi-precious gemstone formed from magma deposits. Chemically its made up of silicone, aluminum, and fluoride. Certain chemical impurities and differences will give it a unique color and appearance. Today, topaz deposits are found in Brazil, United States, Madagascar, Myanmar (Burma), Namibia,  Zimbabwe Mexico, Sri Lanka, Pakistan, Russia, and China.
Common topaz in its natural state is colorless, though trace element impurities can in rare instances make it pale blue or golden brown to yellow orange. Topaz is often treated with heat or radiation to make it a deep blue, reddish-orange, pale green, pink, or even purple.
Color is the most important factor for Topaz. Irradiated Blue topaz and colorless topaz are very affordable and widely available. Natural occurring red, pink and orange colors are rare and valuable. Blue topaz is the most common variety seen in jewelry today and has been produced in large quantities. The huge production of treated topaz has essentially dropped the price of the natural down to that of the treated stone.
 
PLEASE ALSO SEE MY OTHER ITEMS LISTED. I HAVE VARIOUS OTHER ORIGINAL OIL PAINTINGS 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