Eco-Kay is a Hong Kong company that provides natural products.
Luminous gemstone is a type of artificial stone. It absorbs light and emits light in a dark place. The light weakens over time, but it can be used repeatedly. Due to this nature, it is used as an amulet that gives "brightness" and "hope". These Luminous gemstones absorb sunlight during the day and light up at night, and they will glow for up to 2-3 hours after normal daylight exposure.