CURIOUS LARGE 14,80CT GREEN AMETHYST GEMSTONE WITH BEAUTIFUL RECTANGULAR CUSHION CUT

A LARGE 14,80 CARAT (2,96G PLEASE SEE PHOTO MULTIPLY WEIGHT BY 5 TO GET CARATS) SOFT GREEN AMETHYST GEMSTONE WITH A BEAUTIFUL RECTANGULAR CUSHION CUT (rectangular, or square, with rounded edges). COMES WITH A PERSPEX PRESENTATION CASE.
 
HOW CURIOUS? A GEMSTONE CALLED GREEN AMETHYST. EVERYBODY KNOW AMETHYST IS PURPLE.
"Green amethyst" is actually "green quartz." Amethyst itself is purple quartz.
 
NOTE THIS WEEK I HAVE 3 GREEN AMETHYSTS ON AUCTION. BESIDES THIS BEAUTY I HAVE A 17,20CT SQUARE CUSHION CUT GREEN AMETHYST GEMSTONE AND A FLAWLESS 7.0CT OVAL CUT GREEN AMETHYST. 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 PRETORIA SOUTH AFRICAWITH 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.
 
PASSED ALL THE TESTS PERFORMED:
PASSED THE SCRATCH TEST: IT DID SCRATCH A GLASS EASILY (YOU CAN TEST ALSO) WHICH WOULD INDICATE IT IS HARDER THAN GLASS. (MOHS HARDNESS GLASS 5.5-6.5 QUARTZ 7.0-7.5)
PASSED THE ELECTRON UV LIGHT EMISSION TEST: NO REACTION AS IT SHOULD BE FOR AMETHYST. GLASS AND ALL QUARTZ VARIETIES 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 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 MAKES NO MOVEMENT.)
 
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.
 
SIZE: 15,7mm x 18,0mm x 8,7mm
 
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.
 
QUARTZ:
Quartz is a mineral composed of silicon and oxygen, with a chemical composition of SiO2. It is the most abundant mineral in Earth's crust and is resistant to both chemical and physical weathering. When rocks weather away, the residual material usually contains quartz. This is why the sand at most of the world's beaches is quartz.
 
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