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DIAMONDS SOMETIMES FORM NEXT TO NATURALLY OCCURRING RADIOACTIVE ORES, LIKE ONES THAT CONTAIN URANIUM OR THORIUM
THE LIGHT GETS ABSORBED BY ATOMS AROUND THE LATTICE GAP, AND SOMETIMES IN COMBINATION WITH OTHER DEFECTS, INSTEAD OF JUST BEING REFLECTED
DEFECTS TEND TO ABSORB THE RED AND BLUE PARTS OF THE VISIBLE SPECTRUM
SINCE THE MIDDLE OF THE 20TH CENTURY, LABORATORIES HAVE USED ARTIFICIAL RADIATION SOURCES LIKE ELECTRON BEAMS, TO TURN ORDINARY DIAMONDS INTO GREEN ONES
THEY'RE HELD IN SAFE STORAGE UNTIL THEIR RADIOACTIVITY DROPS TO A SAFE LEVEL