Tumbled Sunstone Value Guide

Tumbled Sunstone is a captivating variety of plagioclase feldspar prized for its metallic shimmer known as aventurescence. These modern polished specimens from India carry a rich legacy, echoing the 'sunstones' used by Vikings for maritime navigation and ancient solar myths.

What affects the value of Tumbled Sunstone?

• Intensity and distribution of the shimmering aventurescent effect.
• Clarity of the base feldspar and the density of metallic inclusions.
• Overall size and weight of the tumbled stone, typically valued near $5 for small pieces.
• Quality of the polish and absence of surface fractures or dull spots.

How to Identify Tumbled Sunstone?

• Look for the distinct 'schiller' effect or aventurescence caused by internal light reflections.
• Identify tiny, plate-like inclusions of hematite or goethite within the feldspar structure.
• Check for a warm color palette ranging from golden orange to reddish-brown.
• Verify the smooth, polished surface characteristic of modern Indian tumbling processes.

History of Tumbled Sunstone

Sunstone gets its name from its shimmering appearance, caused by inclusions of hematite or goethite that reflect light, a phenomenon known as aventurescence. Historically, sunstone was believed by some ancient cultures to be a piece of the sun that had fallen to Earth. It was also used by Vikings for navigation, possibly as a polarising filter to locate the sun on cloudy days. Today, it is primarily used in jewelry and as a decorative stone.