Robuta

https://luxe.outlookindia.com/watches-jewellery/jewellery/how-rainbow-diamonds-became-the-most-dazzling-trend-in-luxury-watchmaking
A guide to rainbow-coloured diamonds, how they’re formed, what makes them rare, and why they’ve become a vibrant statement in modern luxury watchmaking
rainbow diamondsbecamedazzlingtrendluxury