What is "briolette"

Briolette \Bri`o*lette"\, n. [F.] An oval or pearshaped diamond having its entire surface cut in triangular facets.

A briolette is an elongated pear-shaped gemstone cut with facets, and it is often drilled to hang as a bead. It was popular during the Victorian times.

The Smithsonian has a diamond briolette necklace presented by Napoleon Bonaparte in 1811 to his Empress consort Marie Louise.