Provenance of a Green Diamond

Green diamonds acquire their color from irradiation, a process that can take place naturally-deep inside the earth over millions of years-or artificially-in a laboratory in a matter of minutes. Because the spectra of an artificially irradiated green diamond are identical to the spectra of a naturally irradiated green diamond, it's impossible to tell them apart, even with sophisticated scientific testing. Fortunately, the famous Dresden Green diamond, the largest natural green diamond in the world at 40-plus cts., has a historical record (or provenance) dating back to 1726, before the advent of artificial irradiation. Since all the literature on the Dresden Green describes the color we see today, we know its origin of color is natural. Radiation as a physical phenomenon was discovered in the early 1900s, and the color-treatment of diamonds using radiation began around the 1930s. So docu
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