Stellini Diamonds

Stellini works from a showroom at Zentralstrasse 119a in Zurich, offering engagement rings in solitaire, halo, trilogy and side-stone styles, plus wedding bands and other fine jewellery. Both natural and lab-grown diamonds are available, certified by GIA and IGI, and the rings are handcrafted in Switzerland. The shop also makes custom pieces.

Every ring comes with a lifetime guarantee and free size adjustment within 60 days, and you can book an appointment for a consultation. An education page sets out the four Cs, and the site is published in English, German, French and Italian. The lean toward finished, handmade rings makes it a good fit if you want a certified stone chosen alongside the ring rather than purely loose.