Blue amber is a rare type of amber that glows blue under ultraviolet light. Features of Blue Amber: Rarity: Unlike regular amber, which is typically yellow or orange, blue amber changes to blue or blue-green when exposed to ultraviolet light. As a natural stone, it may have cracks, dents, and inclusions (internal air bubbles and impurities). There may be slight variations in the size of the beads in the bracelet (within a range of ±0.5mm).