New Delhi: The International Gemological Institute (IGI) has reaffirmed its commitment to applying the universal 4Cs grading system - cut, color, clarity, and carat to all diamonds, including ...
MUMBAI: In a move poised to reshape the global gem trade, the Gemological Institute of America (GIA) has announced it will no longer apply the 4Cs grading system-cut, colour, clarity, and carat weight ...
Two samples of carbon crystals, which are clear and give off a kaleidoscope of spectral colours under direct sunlight, may appear to be identical. However, one is a billion years old, and the other is ...
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