Partners Here are some of the companies that Eurostar collaborates with; Retail Chains : Stjärnurmakarna Din Guldsmed Hörsam Smycken & Kllock Branch Trade Organization NK Juvelsalong 4Sound Insurance company: ERV If Eurostar Retail Support AB · Sveavägen 28-30 · Box 7542 · 103 93 Stockholm · Tel: +46 8 5510 5000 · Fax: +46 8 5510 5099