TTO 0082 Victorian Turquoise Cabochon Victorian turquoise cabochon brooch with turquoise rhinestones on intricate silvertone metal domed base. The stones are beautifully figured and the piece is a delightfully subtle combination of materials. The brooch measures 1 3/8" in diameter. A cabochon or cabachon, from the Middle French caboche (head), is a gemstone which has been shaped and polished as opposed to faceted. The resulting form is usually a convex top with a flat bottom