Judging quality
Look for extremely fine, evenly spaced banding and natural pastel color. Bright pink or blue examples are dyed.
Chalcedony
Fine grey, pink and lavender banding, often with a tiny druzy quartz eye at the centre. Softer and more muted than Mexican agates, and quietly one of the most beautiful.

Look for extremely fine, evenly spaced banding and natural pastel color. Bright pink or blue examples are dyed.
Hard and easy.
Mined near Bobonong in eastern Botswana, where it is a significant small-scale local industry.
Cultural history, recorded as tradition rather than as medical or scientific claim.
See it in person
Both rooms are open six days a week, and there is always someone happy to pull pieces out of the case so you can compare them under the light.