description Sard Overview
Sard is a reddish-brown to brown variety of chalcedony, the microcrystalline form of quartz. Its color is associated with iron compounds, and it grades into the related stone carnelian, which is generally more orange or red. Sard was used in ancient seals, engraved gems, intaglios, and cameos because its durable surface could hold carved designs. The material is of interest to gem collectors, mineral students, and historians of ancient craft.
help Sard FAQ
What is the difference between sard and carnelian?
Both are varieties of chalcedony, the microcrystalline form of quartz, and they grade into each other. Sard is the darker reddish-brown to brown stone, while carnelian is the brighter orange to red one, with the color in both coming from iron compounds.
Is sardonyx made from sard?
Yes, sardonyx is a banded stone combining layers of sard with white onyx. It has been carved for cameos and signet rings since antiquity and is one of the modern birthstones for August.
How hard is sard and how should you care for it?
As a quartz-family stone, sard sits at 7 on the Mohs hardness scale, making it durable enough for everyday rings. It can still be damaged by harder materials like diamonds or corundum, and harsh chemical exposure should be avoided.
What was sard historically used for?
Because of its fine grain and layered color, sard was a favorite material for engraved gems, intaglios, and seals in the ancient Mediterranean world. Seals cut from sard survive from ancient Egypt through the Greek and Roman periods.
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