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 275-carat (55.0 g) diamond briolette necklace presented by Napoleon Bonaparte in 1811 to his Empress consort Marie Louise.
References
Briolette Wikipedia(Text) CC BY-SA