ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,553,831, issued on Feb. 17, was assigned to De Beers UK Ltd (London).
"Doublet detection in gemstones" was invented by Peter Lanigan (Berkshire, Great Britain) and Colin McGuinness (London).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method of characterising a composition of a gemstone comprises irradiating an upper portion and a lower portion of the gemstone with one or more pulses of ultraviolet radiation at a wavelength of substantially 225 nm or less; capturing luminescence emitted by the upper portion of the gemstone and luminescence emitted by the lower portion of the gemstone in one or more time windows having a predetermined relationship wit...