Sieber Agate 4mm Round AA Grade - 15-16 Inch Agate It is highly prized for

It is highly prized for its beautiful combinations of colors and for its opalescence — the pearly luster of the opaque stone

With the possible exception of the horizon meeting the bright blue sky on a perfect summer day

golden brown and red

any color of the rainbow

Sieber Agate 4mm Round AA Grade - 15-16 Inch Agate It is highly prized forSieber agate is not a true agate but rather a glassy, dark blue grey or green copper slag that formed during ancient copper smelting in Germany, specifically from the Siebertal area. This historical "ancient slag" has a naturally swirling, intricate appearance resembling agate due to silica and mineral inclusions from the smelting process. It is a rare and collectible material known for its lapidary qualities, similar to obsidian, and is sometimes