Art Nouveau Style Pear Amethyst & Marcasite Garland Necklace in 925 Sterling Silver The Circle (2017) Movie Poster 1 of 1. A stunning Victorian style necklace crafted from sterling silver set with a amethyst, offset with sparkling marcasite gemstones. Amethyst Information: Number of Stones: 1 Stone Shape: Pear Stone Size: 6mm x 4mm Carat Weight: 0. 36ct Natural Created: Natural Amethyst Country of Origin: Brazil marcasite Information: Number of Stones: 7 Stone Shape: Round Stone Size: 2 x (1. 20mm) 2 x (1. 10mm) 3 x (1. 00mm) Carat Weight: 0. 07ct Natural Created: Natural marcasite Country of Origin: Austria