Fluorescent Vanadium doped Sodium Lanthanum Barium Borosilicate glass bead

broad band green luminescence under UV (we used a 365nm LED lamp for taking the image)
Diameter~ 11mm – height ~ 18mm  – weight ~ 1.5 . 1.7 grams – Material: NaLaBaBSi:V

The image shows the emission spectrum for 329nm excitation.