Gemologists Confounded by 32 carat, Multi-coloured “Koi” Diamond

Diamond News reports on a collection of colored diamonds being displayed at the third U.S. / International Diamond Week in Ramat Gan, Israel, that is unrivaled in the world. The stone is so unique that all gemological experts who have examined it have refused to grade it: a 32-plus-carat multi-colored stone dubbed the Koi Diamond because it resembles the striped Japanese carp fish in shape and hue.

The precious gem was originally unearthed in the Republic of Congo over a decade ago and has confounded analysts ever since. When subterranean forces churned it out millions of years ago, as fate would have it, streams of iron became trapped within the stone, causing it to exhibit a whole range of colors, including light yellow, dark blue, black, and, primarily, orange.

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