Established in 1931, GIA is the world’s foremost authority on diamonds, colored stones, and pearls. GIA exists to protect all purchasers of gemstones, by providing the education, laboratory services, research, and instruments needed to accurately and objectively determine gemstone quality. As creator of the 4Cs and the GIA International Diamond Grading System™, the Institute sets and maintains the standard for grading and identification practices used worldwide. Its global headquarters are based in Carlsbad, California.
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