Montblanc Boheme Platinum-Plated Crystal Fountain Pen with Retractable 18k Nib 7534 Writing System: Cartridge fountain pen (no converter); Nib: Hand-crafted rhodium-plated 18 K gold nib Barrel: Platinum-plated brass with inlaid black lacquer stripes Cap: Platinum-plated brass with inlaid black lacquer stripes, inlaid with Montblanc emblem Trim: Three platinum-plated rings embossed with the Montblanc brand name Clip: Platinum-plated clip set with a synthetic crystal gemstone, with individual serial number