Sardonyx is a semi-opaque Agate that is made of bands of Red Sard and White Chalcedony. The bands have been permanently dyed to enhance its contrasting bands.
Our Semi Precious Stones are genuine and natural unless they are stated to be synthetic in the description. However, you will find the vast majority of Semi Precious Stones are treated in some way, as they would not be stable enough for use in jewellery in their original state.
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