![]() ![]() “The publicity generated by the selling price of the Hancock Red and other significant fancy colored diamonds at auction spurred interest in these rare stones around the world, particularly with celebrities. One explanation is that “defects in the atomic structure that result from gliding (the slight movement of atoms along the octahedral direction) are partially responsible.”. ![]() GIA researchers, who have been studying diamonds for decades and have access to the most sophisticated equipment, are still not sure what causes their color. ![]() In fact, red diamonds are so rare, that GIA records show that over a 30 year period from 1957 to 1987 there was no mention of a GIA lab report issued for a diamond with “red” as the only descriptive term.That’s a rather remarkable statement considering the number of diamonds GIA’s nine global laboratories grade each year, and that GIA has graded many of the world’s most famous colored diamonds.Adding to the mystique of red diamonds is the question of how they get their color. Of all colored diamonds, one color in particular is especially rare: a predominantly red diamond.“Predominantly red” means that red is the primary color with no secondary hues (like purple).
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