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Indonesian Blue Amber is a rare fossilized tree resin fromSumatra that appears red or golden in normal light but fluoresces blue under indirect sunlightor UV light.

Indonesian Blue Amber, also called Sumatran Blue Amber,originates from the island of Sumatra, Indonesia, and is formedfrom the resin of the now-extinct Hymenaea Protera tree, whichexisted around 15–20 million years ago during the Miocene era.The amber crystallized over millions of years, often in coal-rich deposits, andsometimes experienced heat from volcanic activity, which contributed to itsunique optical properties.

This amber typically appears honey-brown or red under normal lighting but exhibits a blue to tealfluorescence when exposed to indirect sunlight or UV light The bluecolor is caused by naturally occurring hydrocarbons, such as perylene,rather than surface pigments . Indonesian Blue Amber is relatively soft,with a Mohs hardness of 2–2.5, making it suitable for pendants,beads, and display pieces rather than items subject to rough wear.