Hope Diamond originally came from French crown. New technique can create huge diamonds Huge African diamond sells for over $12 million...
The Hope Diamond glows a mysterious red when exposed to ultraviolet light, a finding that scientists say can help them "fingerprint" diamonds and tell the real ones from artificial.
The phosphorescence comes from boron in the gem, the same element that makes it appear blue in normal light, explained Jeffrey Port, curator of the National Gem Collection at the Smithsonian's National Museum of Natural History.
The 45.52-carat blue Hope Diamond is on display at the Natural History museum, but Post said lighting conditions there don't allow it to be shown in ultraviolet light. He said the museum hopes to make a video of the stone when it glows — which continues for some time after the light is turned off — so visitors can see that.
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Résuméabuiyad
We've been asked a few times if we can supply the raw diamond crystal made from the ashes of a loved-one, well we could I suppose, but what would be the point? The idea of cutting and polishing diamonds is to capture the flashes of fire, the scintillation of light which diamonds do so well. You may as well encapsulate your ashes into glass, it would be cheaper and probably more suited. So I think we have to decline from even going there, after all 'fancy' diamonds arre so valuable in any case, it would be a shame to make a diamond out of a loved-one and then present it a just a rough crystal. Better to cut and polish it to allow it to shine and last forever. 
