... 220V or 110V can be choos jewelry ultraviolet fluorescent lamp Ultraviolet Lamp with dual wavelenth:365nm long wave and 254nm short ... diamond is moved in drawer type observe darkroom.Non-fluorescent soft baseboard, benefit for observing effect and protecting the ... Fluorescent light is harmful to eyes,when testing the gem,do remember don't look at the light directly. jewelry ultraviolet fluorescent lamp ...