Sterling Silver Bauxite Small Rhombus Ring. R606. This stylish ring features a rhombus shaped cabochon of highly polished hand carved white Bauxite which is framed within a deep sterling silver setting. The ring has been designed and made within our workshops in Derbyshire, Ashbourne and matching items are available within the collection. Bauxite is a pure white material which has a highly vitreous lustre when polished, predominantly an Aluminium based material. Dimensions: Bauxite 22 x 22mm.