One of the rarest forms of agate -- fire agate -- has been available commercially only in the last 60 years. Fire agate is a brown agate which has a botryoidal or grape-like growth form. What is special about fire agate is that it contains layers of plate-like crystals of iron oxide (limonite) in various planes.
The iridescent colors of red, gold, green and, occasionally, blue-violet, result from interference between diffracted light rays traveling through and reflecting from these thin layers.
Hand Cut Designer Freeform Cabochon, High gloss polish front and sides. AJC-215
Measures: 46mm x 35mm x 7mm
Carat Weight: 95.09