For a coin, slab, or special flat stone, a bail clip can make the piece wearable without altering it with a hole. The open single bail clamps on and turns the object into a pendant.
Visually Speaking
The lobster clasp is standard on both necklaces and bracelets. On delicate bracelet styles specifically, its compact size is an advantage: a larger clasp would visually and physically overpower a fine chain or thin bangle profile.
Meet The Maker
Internationally recognized fine jewelry houses and designer collections answered the sterling silver luxury question some time ago by making it their standard metal, allowing the material's luxury segment position to reflect industry practice rather than aspiration.