Agate

I often see cheap accessories made of agate sold in street stalls and such but are they the real thing?

The wearing of agate ornaments was even believed to be a cure for insomnia and was thought to insure pleasant dreams.

The ends of the veil, drawn over her head, were embroidered with silver; she had long gold ear-rings; to a rich and large gold chain was suspended a cross set with precious stones; and over the arm of her chair hung a rosary of agate beads.

Yes: living among the cohabations^([sic]) of Faust himself, among the litharge and agate and hyacinth and pearls.

Go to it then hardily, and let us be agate.

I'm fear'd you have some ill plans agate.