Amiperhetū

"Traveling from the southernmost coast, I arrived upon an group of islands arranged in such a way as to create a circle within the seas. Living upon these islands were giants who glimmered with strange lights across their bodies...adorning them and many of their weapons was a curious sort of stone. It reminds one of barnsteen but rather than being a golden color, speckled through with orbs of black, brown and yellow, it instead was the same color as the ocean, as if one of the gods in a mood of playful imagination, reach down and turned over a portion of the water in their hands as one may turn over karamel. Unlike barnsteen, too, this strange stone glimmered in the dark with all those colors that this strange ocean may create--not just blues and greens but also violets and rose." - Entry from the Travel Log of Heiga: Being an Account of the Star-Glass Sea and Her Inhabitants.
The wondrous material known as 'amiperhetū' or 'Star Amber' is created only in the Star-Glass Sea and forms from the leaking of sap from the ancient and submerged portions of the Star Glass Isles that fell beneath the waves during the eruption of the volcano Pikitanga nearly three thousand years ago. Exposed to the bio-luminescent properties of the waters as it forms, the amber is transfigured into an equally luminescent substance that is valued for its beauty by the Vegali peoples. Use for adornments and in the creation of shrines and effigies, they are revered as holding the breath of the very stars and the sea and because of it association with heavens, the Vegali people will use nothing else in the creation of their tools of divination. There are very few true Vegali crystal balls; finding a single piece of Amiperhetū large enough to fashion a working foci out of is truly a once-in-a-century opportunity and any family that has one of these crystals will protect it jealously.