Very brightly fluorescing specimen of corundum (var. ruby), with "trigons", from the Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar.
~5 mm X ~5 mm X ~1 mm
Shown in the gallery below: 365 nm longwave UV, 395 nm near UV, blue light (450 nm), and 6500K visible light.
