HUGE 27,40CARAT GOLDEN YELLOW CITRINE GEMSTONE WITH BEAUTIFUL FACETTED CUSHION CUT

WHAT A LOVELY GEMSTONE AND OF THE LAST CITRINES WE HAVE! AN AWESOME LARGE 27,4 CARAT (5,48G PLEASE SEE PHOTO multiply weight by 5 to get carats) YELLOW GOLD CITRINE GEMSTONE WITH A BEAUTIFUL CUSHION CUT. COMES WITH A SMALL PERSPEX PRESENTATION CASE.
 
THIS PARTICULAR STONE WAS BOUGHT ONLINE FROM A SELLER IN SOUTH AFRICA IN 2011 WITH THE COUNTRY OF ORIGEN INDICATED AS BRAZIL. 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 HEATED NATURAL GEMSTONE.
 
TESTS PERFORMED:
PASSED THE THERMAL CONDUCTIVITY TEST: TESTED THE THERMAL CONDUCTIVITY WITH A MIZAR PRESTIGE SERIES 2 DIAMOND TESTER. IT MOVED UP THE LADDER A LITTLE FROM STANDARD LEVEL 3 TO LEVEL 4. FOR QUARTZ A LEVEL OF 4 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. RUBIES AND SAPPHIRE 0,08 GIVES A THERMAL OF 6 TO 7.)
 
SIZE: 21.6mm x 17,5mm x 12.6mm
 
MY PERSONAL CONCLUSION REGARDING THIS GEMSTONE:
COMMON QUARTZ IN ITS NATURAL STATE IS COLORLESS, THOUGH TRACE ELEMENT IMPURITIES CAN IN RARE INSTANCES MAKE IT PALE BLUE OR GOLDEN BROWN TO YELLOW ORANGE. NATURALLY OCCURRING CITRINES ARE EXTREMELY RARE.
QUARTZ IS OFTEN TREATED WITH HEAT OR RADIATION TO MAKE IT A DEEP BLUE, REDDISH-ORANGE, PALE GREEN, PINK, OR EVEN PURPLE. IT WAS STATED THAT THIS IS A HEATED QUARTZ GEMSTONE.
CITRINES CAN ALSO BE GROWN HYDROTHERMALLY IN LABS. SYNTHETIC CITRINES CAN BE MANUFACTURED IN SUFFICIENT QUANTITIES AND AT A LOWER COST THAN NATURAL CITRINES.
MY CONCLUSION:  IT IS PROPABLY A NATURAL HEATED QUARTZ OR SYNTHETIC CITRINE GEMSTONE
 
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.
 
CITRINE: Citrine is the yellow variety of quartz, and its name comes from the Old French word for lemon. The yellow colour is caused by traces of iron in the quartz. This occurs very rarely in nature, so most citrine is made by heat-treating other varieties of quartz - usually purple amethyst or smoky quartz, which are both more common and less expensive.
By applying heat to these gems, they turn from their original colour to a gorgeous shade of gold. Natural citrine is almost always a pale-yellow colour and commands a far higher price than the processed variety. The most sought-after citrine gemstones are a clear, radiant yellow-to-brownish-red colour, however this is particularly rare for naturally-occurring citrine. This rarity means that the natural stones that fall into this colour category have a particularly high price tag. 
The most abundant sources of natural citrine are found in Bolivia, Madagascar, Mexico, Spain and Uruguay. Amethysts that are heat-treated to a golden colour are mostly mined in Brazil, although other sources include France, Russia and the US, specifically California, Colorado and North Carolina.
 
LARGE BEAUTIFUL ENGAGEMENT RINGS: Citrines make fine jewelry stones. Like most quartz it's available in large sizes and with a hardness of 7 gem cutters. can easily use this stone for dramatic and intricate cuts. Citrines can make beautiful, large engagement ring stones and they make durable jewelry stones that require little special care.
 
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