African Petrified Wood Agate 10mm Round - 15-16 Inch New Diamond Cut Rounds red and gray in swirling

red and gray in swirling circular patterns

It was originally named for the visible inclusions of the mineral Cacoxenite

Many of the earliest gem traders did not realize that these yellowish stones were actually different materials

Dutch Colonel Hendrik Von Prehn

including shiller — a sometimes iridescent bronzelike luster — in some stones

African Petrified Wood Agate 10mm Round - 15-16 Inch New Diamond Cut Rounds red and gray in swirlingPetrified Wood Agate is formed from the petrifaction process of primeval trees over the course of many years. Petrification occurs when the wood is covered by sedimentary rock, as waters loosen and decompose the organic elements and replace them with silicate substances, while maintaining the wood's original structure. Preservation is enabled by a lack of oxygen.