HOW STRANGE? A LARGE 26,80CT GREEN AMETHYST GEMSTONE WITH BEAUTIFUL CUSHION CUT

AN AWESOME LARGE 26,80 CARAT (5,36G MULTIPLY WEIGHT BY 5 TO GET CARATS) GREEN QUARTZ GEMSTONE WITH A BEAUTIFUL CUSHION FACETTED CUT. The cushion cut, also called the pillow cut, is essentially a square with rounded corners and sides, like the cushions of a couch. COMES WITH A BEAUTIFUL PERSPEX PRESENTATION CASE AND VELVET BAG.
 
THIS PARTICULAR STONE WAS BOUGHT FROM A SELLER IN MOSSEL BAY SOUTH AFRICA WITH THE COUNTRY OF ORIGEN INDICATED AS URUGUAY. 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 AN HEAT TREATED BUT NATURAL QUARTZ GEMSTONE.
 
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, QUARTZ 7.0-7.5)
PASSED UV LIGHT TEST: INERT NO UV 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 4. FOR QUARTZ A LEVEL OF 4 IS THE NORM FOR THIS TESTER.
(WITH THIS TESTER GLASS NO MOVEMENT.)
 
SIZE: 21,0mm x 18,1mm x 11,2mm
 
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 PRELIMARARY TESTS ON EACH GEMSTONE.
 
NATURAL OR SYNTHETIC
Natural green quartz is usually created from heat treating some varieties of quartz, mostly amethyst. This association seems to permit the use of the misnomer Green Amethyst. Green heat-treated quartz has its own name, "Prasiolite." Which nobody is familiar with.
Given the low price for natural quartz varieties, it may come as a surprise that there is a large industry producing synthetic quartz using a method known as hydrothermal transport and recrystallization.
Though the cost of producing synthetic quartz is not much less than mining natural quartz, a large industry has developed to create synthetic quartz.
Small fragments of quartz that act as a source material are placed on the bottom of a container and acts as numerous small seed crystals of quartz. This method was designed to produce colorless quartz for industrial applications. But it is also possible to grow synthetic quartz in colors not found in nature, including unusual multicolored combinations.
Though the synthetic quartz is real quartz composed of crystals of silicon dioxide just like natural quartz, in many cases it can be difficult to distinguish the synthetic material, but gemologists can usually identify the presence of seed crystals in synthetic quartz.
 
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