Beryl Var. Aquamarine - "The Helix", Marambaia, Carai, Jequitinhonha Valley, Minas Gerais, Brazil, large-cabinet, 24.5 x 12.6 x 9.3 cm, The famous "Helix Aqua" owned for generations by the family of Professor Doctor Hermann Bank of the famous Idar-Oberstein family of gemcutters: This piece was the best piece in his collection, and was the cover of his private book (1981)., For sale from The Arkenstone, www.iRocks.com. For more details on this piece and others, visit…