Fire agate hides iridescence inside botryoidal chalcedony: iron-oxide layers create shimmering bubbles of green, gold and red that cutters unmask layer by layer — every finished stone is a sculpted one-off. Mexico and Arizona are the classic sources; hardness about 7.Our fire agates are natural, certified by the GEMIC Institute laboratory and filmed so the iridescence of the exact stone is visible. Unique pieces; tracked delivery worldwide, 30-day inspection.