Several models show green stones: in the Bohème Vert there is a synthetic emerald in the clip, in the Jungle Eyes collection a tourmaline and in some Patron of Art editions peridot stones. With the Atelier Privés pieces, real sapphires are used. The cap of the Meisterstück Solitaire Nikolai edition consists of ground and newly bound malachite and was produced in gold and platinum variants. The Nikolai series is no longer being made; remaining stock is available via specialised dealers.