I haven't seen this phenomenon before. The fancy yellowish brown contained a remarkable hydrogen cloud in the blade and cape features in the hilt. The stone showed corresponding areas of yellow and blue fluorescence in long-wave UV light. The cutting style of this diamond, while unconventional, served to showcase the remarkable fluorescence scene illuminated within. The fluorescence differences allow this diamond to be imagine as a lightsaber or a sword of fire and ice. Many thanks to GIA Carlsbad Laboratory for Color Origin and Identification Service.
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