[Alexandrite] Ametrine [Chrysoberyl] Crystalline Quartz [Excellent] Good [Yes_4] No Use a commercial jewellery cleaner or a mild soap and water solution and clean with a soft toothbrush. Avoid exposure to sunlight and strong artificial light to prevent the colour from fading. [Yes] 
Yes
Y e s
N o
Y e s U n l e s s c o a t e d