Montblanc StarWalker Special Edition Diamond Star Rollerball Pen. The barrel and cap are made of black precious resin, Montblanc floating diamond star in transparent cap top. Special Edition Diamond Star Pen. SOULMAKERS FOR 100 YEARS Special Edition: Starwalker Unlimited – Ballpoint. Each product is adorned with a patented Montblanc-cut diamond featuring Wesselton colour and VS/SI quality. Features precious black resin and platinum trims.