Since every isotope that spews gamma or X rays or charged particles does so in a unique way--an atomic fingerprint, of sorts--the color and intensity of the flash tells the detector which isotope is present and in what quantity.

FORBES: Stopping Porta-Nukes

Fancy colored diamonds are found in 12 different colors with more than 90 secondary hues and nine intensity levels within the 234 color combinations.

FORBES: A Guide for Fancy Colored Diamonds

In addition, the report notes that the original rough stone from which The Vivid Yellow was cut must have possessed an extraordinary intensity and thus required no modified faceting in the cutting process to help bring out the color.

FORBES: Flaming Yellow 32-Carat Diamond May Fetch $8M at Auction