PURPLISH RED GISA CERTIFIED 5.25CT NATURAL SPINEL (RARER THAN RUBIES) GEMSTONE WITH ANTIQUE CUSHION CUT

A BEAUTIFUL 5.25CT (1,05G PLEASE SEE PHOTO MULTIPLY WEIGHT BY 5 TO GET CARATS) PURPLISH RED SPINEL GEMSTONE WITH ANTIQUE CUSHION CUT. (Antique simply means before modern day cutting instruments) COMES WITH A SUPPLIED GISA CERTIFICATE.
 
THIS PARTICULAR STONE WAS BOUGHT IN 2011 FROM AN ONLINE SELLER. COUNTRY OF ORIGEN WAS NOT INDICATED. IT HAS A SI2 CLARITY (INCLUSIONS EYE VISIBLE) WHICH MEANS YOU CAN SEE INCLUSIONS WITH THE NAKED EYE. IT WAS ALSO SOLD AS A NATURAL UNHEATED SPINEL GEMSTONE. NO COLOR ENHANCEMENT WAS INDICATED.
 
THIS SPINEL GEMSTONE PASSED OR GAVE AN UNCLEAR ON ALL THE TESTS I COULD PERFORM:
PASSED ELECTRON UV LIGHT EMISSION TEST: WEAK RED UV LIGHT REACTION (PLEASE SEE PHOTO).
SPINELS ARE ONE OF THE FEW GEMSTONES THAT CAN SHOW FLUORESENCE.
NATURAL RED, ORANGE, PINK AND COLORLESS SPINEL: inert to weak red and orange (lw).
ALL OTHER COLORED NATURAL SPINELS: Virtually inert.
SYNTHETIC RED SPINEL: strong red (lw) SYNTHETIC BLUE SPINELS: red to orange to blueish white.
SYNTHETIC GREEN SPINELS: red to yellowish green.
(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 THERMAL CONDUCTIVITY TEST: TESTED THE THERMAL CONDUCTIVITY WITH A MIZAR PRESTIGE SERIES 2 DIAMOND TESTER. IT DID MOVE UP THE LADDER FROM STANDARD LEVEL 3 TO LEVEL 5. FOR SPINELS 0,028 A LEVEL OF 4 TO 5 IS THE NORM FOR THIS TESTER.
(WITH THIS TESTER GLASS 0,002, TANZANITE 0 005, AND TITANITE MAKES NO MOVEMENT, TOURMALINE 0.012 AQUAMARINE 0.013 AND EMERALD 0.013 AND GARNETS 0.012 AND KUNSITE 0.013 LIE INBETWEEN AND CAN GIVE A LEVEL OF 3 OR 4. QUARTZ 0,020 GIVES A THERMAL OF 4, SPINELS 0,028 ALSO LIE IN BETWEEN AND CAN GIVE A THERMAL OF 4 TO 5; TOPAZ 0,04 GIVES A THERMAL OF 5 TO 6. RUBIES AND SAPPHIRE 0,08 GIVES A THERMAL OF 6 TO 7.)
 
SIZE: 11.2mm x 8,7mm x 6,3mm
 
MY PERSONAL CONCLUSION REGARDING THIS GEMSTONE:
IN NATURE SPINELS ARE SURPRISINGLY RARER THAN RUBIES. SYNTHETIC SPINELS ARE EASILY CREATED IN A LAB AND ARE WIDELY SEEN AND ENCOUNTERED.
OUR STONE SHOWS A WEAK RED UV REACTION MORE INDICATIVE OF NATURAL SPINELS. ITS THERMAL CONDUCTIVITY ALSO TESTS IN THE SPINEL RANGE.
IT HAS SOME INCLUSIONS VISIBLE WHICH IS ALSO A GOOD INDICATION THAT IT IS A NATURAL GEMSTONE SIBCE LAB CREATED STONES ARE MORE OFTEN FLAWLESS.
MY CONCLUSION:  IT IS MOST PROPABLY A NATURAL SPINEL GEMSTONE
 
DISCLAIMER: I AM NO GEMSTONE EXPERT AND NONE OF THE PRELIMERY TESTS I COULD PERFORM (SCRATCH TEST; UV TEST; THERMAL TEST) CAN CONFIRM THIS GEMSTONES NATURE AND PROPERTIES. 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. ADVANCED INTRUMENTS ARE NEEDED TO DISTINGUISH ONE GEMSTONE FROM ANOTHER AND TO CONFIRM IF IT IS NATURAL OR LAB MADE.
 
SPINEL (BALAS RUBIES):
Spinel is an relatively unknown semi-precious gemstone. Spinel is the magnesium aluminium oxide (MgAl2O4) member of the larger spinel group of minerals.  Its name comes from the Latin word spinella, which means spine in reference to its pointed crystals. It has a hardness of 8 on the Mohs hardness scale.
Spinel is seen in a wide range of colors: red, lavender, violet, blue, green, brown, black.
WELL, IT WASNT ALWAYS EASY TO TELL THE DIFFERENCE BETWEEN A DEEP RED SPINEL AND A RUBY. OFTEN, SPINEL IS FOUND IN GRAVEL DEPOSITS WHERE THERE IS MUCH CORUNDUM AS WELL. THATS WHY MANY HISTORICAL CROWN JEWELS ACTUALLY CONTAIN SPINELS, AND NOT RUBIES. IN FACT, SOME SPINELS ARE CALLED BALAS RUBIES, NAMED FOR THIS SIMILARITY AND THE BALASCIA CENTRAL ASIA REGION IN WHICH THEY WERE OFTEN FOUND.
YOU MAY BE SURPRISED TO KNOW THAT SPINEL IS RARER THAN RUBY, BUT THIS HAS NOT AFFECTED ITS PRICE (YET). SPINEL IS STILL LESS EXPENSIVE THAN RUBY, BUT THE MARKET FOR SPINEL HAS BEEN INCREASING.
Synthetic spinel can also be created, providing an economical option that still boasts the clarity and beauty of the natural version.
 
PLEASE ALSO SEE MY OTHER ITEMS LISTED. I HAVE VARIOUS OTHER GEMSTONES ON AUCTION THIS WEEK. COPY THE URL UNDERNEATH AND PASTE INTO GOOGLE AND IT WILL TAKE YOU DIRECTLY TO ALL MY LISTINGS THIS WEEK. NOTE MY AUCTIONS ALL CLOSE AT 22h30 SO PLEASE BUT IN AN AUTOMATIC BID (HIGHEST PRICE YOU ARE WILLING TO PAY) IN ORDER NOT TO BE DISAPPOINTED.
https://www.bidorbuy.co.za/seller/3685641/ErnRex1545