Learn about the differences – and similarities – between natural and laboratory-grown diamonds, and how GIA’s researchers and grading laboratories can tell the difference
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While more people are becoming familiar with lab-grown diamonds, many still don’t know how they are actually made. Learn about the two diamond growth processes, HPHT and CVD.
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GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.
Read MoreWhat exactly are man-made diamonds? Find out how they compare to natural diamonds and what you should know.
Read MoreModern gemmologists use the word “jade” as a generic term for both nephrite and jadeite. These minerals have been linked throughout history.
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Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.
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Laser confocal microscopy, a very reliable method of revealing surface micro-features, is used on an HPHT synthetic diamond to reveal growth structures.
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Irradiated CVD-grown diamonds are examined in the Carlsbad lab.
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A single natural diamond is found within the largest percentage of undisclosed synthetic melee submitted to GIA.
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A synthetic diamond seen in the Carlsbad lab is the largest faceted lab-grown diamond examined by GIA.
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