Collier pendentif lumineux en pierre naturelle brillante pour femme, bijou tendance, idéal comme cadeau ou pour vous offrir a vous-même.Overview: Luminous products have a good absorption effect on ultraviolet rays. They absorb light in the daytime and emit light in the dark, and so on. During the day, it is placed in the sun or outdoors where there is ultraviolet light, which shines in the dark. The intensity and duration of light are different, the luminous intensity will be different, about 30 minutes after irradiation can be more than a few hours of light. When there is no