ROUGH 12,37CARAT NATURAL MADAGASKAR RED RUBY GEMSTONE SCRATCH GLASS EASY! UV LIGHT FLUORESCES RED!

A LARGE 12,37 NATURAL ROUGH RED RUBY GEMSTONE FROM MADAGASKAR. COMES WITH A BEAUTIFUL PERSPEX PRESENTATION CASE AND VELVET BAG. THIS ROUGH RUBY PASSED ALL THE TESTS I COULD PERFORM: IT SCRATCHED GLASS EASILY! IT FLUORESCES RED! IT DID NOT LEAVE A RED STREAK WHEN SCRATCHES GLASS. COULD NOT SCRATCH IT WITH A STEEL NAIL. TESTED HIGH ON THERMAL CONDUCTIVITY!
 
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 WHICH MEANS BASICLY IT HAS BEEN BAKED IN AN OVEN TO ENHANCE THE COLOUR A BIT.
 
I THINK IT IS INDEED A REAL RUBY GEMSTONE AS IT PASSED ALL THE TESTS I COULD PERFORM:
PASSED THE SCRATCH TEST: IT SCRATCHES GLASS EASILY IT IS HARDER THAN GLASS.
(MOHS HARDNESS GLASS 5.5-6.5 RUBIES 9.0)
PASSED THE RUB TEST: OUR RUBY DID NOT LEAVE ANY COLOR STREAKS WHEN IT SCRATCHED GLASS.
(Real rubies will never leave a red streak)
PASSED THE ELECTRON UV LIGHT EMISSION TEST: GIVES A STRONG RED FLUORESCENCE UNDER UV LIGHT. 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.)
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 6. 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: 12mm x 7mm x 9mm
 
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 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.
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 and a resulting fall in prices.
The color and clarity of rubies and sapphires is commonly enhanced by heat treatment and, less frequently, by irradiation. Although not commonly disclosed by retailers, such processes are widely acknowledged within the industry and are probably today the rule rather than the exception. 

PLEASE ALSO SEE MY OTHER ITEMS LISTED. I HAVE SOME OTHER GEMSTONES ALSO ON AUCTION THIS WEEK.