Sized by inner diameter, not wrist size, bangle bracelets are calibrated to how big the hand is at its widest point. Hinged and adjustable designs work best for anyone who falls outside of standard sizes.
A Storied Heritage
The Hope Diamond, the Koh-i-Noor, the Cullinan, and the Regent are each more history than geology at this point, their documented movements through royal collections and national narratives across multiple continents having accumulated more human significance than any geological description of their formation could account for.
Built For Ease
Jewelry formats tend to work best with the closure that least disrupts them. For pearl strands, multi-strand necklaces, tennis bracelets, and flat chain bracelets, that answer has long been the box clasp: flat, low-profile, and structurally invisible.