Gold finger-ring; cornelian bezel in form of cat; wedjat-eye on underside.

From Wikipedia:

Wadjet was closely associated in the Egyptian pantheon with Bast, the fierce goddess depicted as a lioness warrior and protector, as the sun goddess whose eye later became the eye of Horus, the eye of Ra, and as the Lady of Flame.

She later became identified with the war goddess of Lower Egypt, Bast, who acted as another figure symbolic of the nation, consequently becoming Wadjet-Bast. In this role, since Bast was a lioness, Wadjet-Bast was often depicted with a lioness head.

Top photos via The British Musem.
Middle photo an example of the source mineral from Wikimedia Commons
Bottom photo Wikimedia Commons.

Via The British Musem.