GLISTERING MARGUISE CUT SKY BLUE TOPAZ 0.7CT GEMSTONE

A BEAUTIFUL 0.7CT (0.14G PLEASE SEE PHOTO MULTIPLY WEIGHT WITH 5 TO GET CARATS) SKY BLUE TOPAZ GEMSTONE WITH A SPARKLING MARGUISE CUT. (Marquise cut is an elongated elliptical shape with pointed ends.) 
 
THIS PARTICULAR STONE WAS BOUGHT ONLINE IN 2011 FROM A SELLER IN SOUTH AFRICA WITH THE ORIGEN OF THE STONE INDICATED AS AFRICA. 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 SOLD AS A NATURAL BLUE TOPAZ AND AN ENHANCED TREATMENT WAS INDICATED.
 
THE 3 BLUE COLORS OF TOPAZ:
SKY BLUE TOPAZ IS THE LIGHTEST COLOR OF BLUE TOPAZ WHERE WHITE TOPAZ IS IRRADIATED FOR 3 MONTHS TO CHANGE THE COLOR.
SWISS BLUE TOPAZ IS THE MEDIUM COLOR OF BLUE TOPAZ WHERE WHITE TOPAZ IS IRRADIATED FOR 2 YEARS TO CHANGE THE COLOR. IF YOU ASK ME THIS IS THE MOST BEAUTIFUL OF THE BLUE TOPAZ. ITS VALUE IS AROUND $25 PER CARAT.
LONDON BLUE TOPAZ IS THE TOP COLOR OF BLUE TOPAZ WHERE WHITE TOPAZ IS IRRADIATED FOR 4 YEARS TO CHANGE THE COLOR. IT IS A INKY GREY KIND OF BLUE
 
THIS TOPAZ GEMSTONE PASSED ALL THE TESTS THAT I COULD PERFORM:
PASSED ELECTRON UV LIGHT EMISSION TEST: NO UV REACTION AS IS EXSPECTED.
NATURAL BLUE TOPAZ SHOULD SHOW A MODERATE YELLOW OR GREENISH TO NO REACTION UNDER UV LIGHT. IRRADIATED TOPAZ LIKE A LONDON BLUE SHOULD SHOW A WEAK TO NO REACTION.
 (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 0,002, TANZANITE, TITANITE AND TOURMALINE MAKES NO MOVEMENT, AQUAMARINE AND EMERALD LIE INBETWEEN AND CAN GIVE A LEVEL OF 3 OR 4. QUARTZ 0,026, GARNETS, SPINELS 0,028 AND KUNSITE GIVES A THERMAL OF 4, TOPAZ 0,04 GIVES A THERMAL OF 5 TO 6. RUBIES AND SAPPHIRE 0,08 GIVES A THERMAL OF 6 TO 7.)
 
SIZE: 7.9mm x 4.0mm x 3.0mm
 
MY PERSONAL CONCLUSION REGARDING THIS GEMSTONE:
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. IT WAS STATED WHEN BOUGHT THAT THIS IS A NATURAL TOPAZ WITH SOME ENHANCED TREATMENT APPLIED.
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 AND SYNTHETIC TOPAZ IS SELDOM ENCOUNTERED. IN FACT, SYNTHETIC TOPAZ CAN BE SEEN SOLD AT A VALUE MORE THAN NATURAL TOPAZ.
MY CONCLUSION:  IT IS PROPABLY A NATURAL TOPAZ GEMSTONE THAT HAS BEEN IRRADIATED
 
DISCLAIMER: THIS 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 AM NO GEMSTONE EXPERT AND COULD ONLY PERFORM SOME PRELIMINARY TESTS - ADVANCED INTRUMENTS ARE NEEDED TO DISTINGUISH ONE GEMSTONE FROM ANOTHER AND TO CONFIRM IF IT IS NATURAL OR LAB MADE.
 
TOPAZ INTERESTING FACTS:
The first topaz was found in 1737 in Germany. Later, in 1740, a larger sample was found in Brazil. Initially there was a lot of confusion about what these gemstones actually were. Topaz was once famously mistaken for diamond. A 1680 carat topaz was mined in Brazil and named the Braganze Diamond. This stone was set in the Portuguese crown and was believed to be one of the largest diamonds ever found. It was later realised that this large, glistening stone was actually a colourless topaz.
This gemstone is found all over the world. It has been mined in countries including Brazil, Russia, Zimbabwe, Germany and the United States of America. There are large mines in Utah that invite people to visit to mine their own topaz.
Topaz can grow to an incredibly large size. The Museum of Natural History in New York City houses the heaviest topaz. This stone weighs 600 pounds (272kg). The largest faceted topaz is called the El-Dorado Topaz found near the mythical city El Dorado in south America and weighs 31,000 carats. It is believed to be the largest faceted gemstone in the world. It was cut into a flawless emerald shape and is an eye-catching yellow colour.
 
PLEASE ALSO SEE MY OTHER ITEMS LISTED. I HAVE VARIOUS OTHER GEMSTONES ALSO ON AUCTION THIS WEEK. IN FACT THIS MIGHT BE THELAST BATCH FOR A WHILE SO PLEASE SHOP WITH YOUR HEARTS INTENT. 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