INTERESTING ROUGH 13,50 CARAT PIECE OF COMPOSITE RUBY GEMSTONE WITH RUBY AREA VISIBLE IN RED ON UV SCAN!

A LARGE 13,50 CARAT (2,70G) ROUGH CHUNK OF RUBY GEMSTONE FROM MADAGASKAR. THIS PARTICULAR STONE WAS BOUGHT IN 2011 FROM A SELLER IN CHANTABURI THAILAND WITH THE ORIGEN OF THE STONE INDICATED AS MADAGASKAR. IT WAS SOLD AS A NATURAL RUBY THAT HAS BEEN HEAT TREATED WITH A LEAD-GLASS FILLING.
 
IT IS BASICLY AN COMPOSITE GEMSTONE WHICH MEANS THE COLOR AND CLARITY WAS ENHANCED BY FILLING A NATURAL RUBY FRACTURE WITH LEAD GLASS (This technique create a larger stone for a cheaper price). They are made by using a combination of lower-quality corundum, the mineral found in ruby, which is then infused with lead glass. The mixture is heated at high temperatures and then cooled, cut and polished.
 
A COMPOSITE RUBY IS MADE FROM MULTIPLE PIECES OF POOR QUALITY CORUNDUM (THE MINERAL WE CALL A RUBY WHEN IT'S RED) BONDED TOGETHER WITH TINTED LEAD GLASS. SOMETIMES THERE'S MORE RUBY THAN GLASS, SOMETIMES THERE'S MORE GLASS THAN RUBY, SAYS CHRISTOPHER SMITH AT THE AMERICAN GEMOLOGICAL LABORATORIES IN NEW YORK.
 
HERE ARE THE RESULTS OF THE TESTS I COULD PERFORM:
THE ELECTRON UV LIGHT EMISSION TEST:
MOSTLY INERT WITH SMALL RUBY AREA BEAUTIFULLY LID UP IN UV WEAK RED PLEASE SEE PHOTO.
NATURAL RUBIES USUALLY SHOW WEAK RED FLUORESCENCE. A SYNTHETIC RUBY USUALLY SHOWS A STRONG RED FLUORESCENCE.
(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.)
THERMAL CONDUCTIVITY TEST: TESTED THE THERMAL CONDUCTIVITY WITH A MIZAR PRESTIGE SERIES 2 DIAMOND TESTER. IT DIFFERED DEPENDING ON AREA TESTED FROM FROM STANDARD LEVEL 3 (GLASS AREAS) TO LEVEL 5 AND 6 (RUBY AREAS). FOR SAPPHIRES AND RUBIES A LEVEL OF 6 TO 7 IS THE NORM FOR THIS TESTER. (WITH THIS TESTER GLASS AND QUARTZ MAKES NO MOVEMENT.)
 
SIZE: 13mm x 8mm x 6mm
 
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 PRELIMINARY TESTS ON EACH GEMSTONE.
 
RUBIES: Firstly Rubies is one of the four precious gemstones amongst Saphire, Diamond and Emerald. Real rubies rank 9 on the Mohs scale of Hardness. Only a diamond can scratch real rubies.
Ruby is a red type of the corundum mineral, along with sapphire. Sapphires have each color of the corundum, except red, which is the color of the ruby.
Corundum is relatively common in nature, and is completely colourless. Chromium causes the red colour in rubies with Burma having the best most intense red rubies in the past.
Corundum once found wide application as an industrial abrasive like sandpaper. Gem corundum is mined almost exclusively from gem gravel deposits. Historically, production has been from Myanmar (Burma), Thailand, India and Sri Lanka (Ceylon). Rubies are known as the King of Gemstones and Myanmar and Thailand honor the corundum ruby as their national stone. More recent important sources include East African countries of Madagascar, Tanzania and Mozambique.
Corundum was the first gem mineral to be synthesized in the lab by a process known today as flame fusion and flux growth. Synthetic rubies and sapphires are presently manufactured in enormous quantities for both industrial and gem application.This caused widespread apprehension and greatly diminished ruby sales. Extensive British ruby and sapphire mining operations in southeast Asia, particularly in Burma, suffered greatly from the resulting fall in prices.
The color and clarity of rubies and sapphires is commonly enhanced by heat treatment and, less frequently, by irradiation.
 
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