What is Agate?
Agate is a polycrystalline quartz with distinct colour banding. The bands are typically white to blue-white and various shades of brown. However, being relatively porous, agate is often dyed or stained in any colour. Agate has been used for carvings and engraved gems, such as seals since ancient times. Where the banding is straight rather than curved, the gems are often called onyx.
In Medieval times it was said that agate would calm storms, sharpen sight, increase strength and make the wearer eloquent and polite. If so, it would make this gem ideal for sailors, public speakers and those who are sometimes might be deemed a little less than polite.