Avita Jewellery is a studio based bespoke jeweller based in London - Hatton Garden. Specialising in diamond and moissanite engagement rings. Avita Jewellery is a Hatton Garden-based bespoke jeweller with a studio. Diamond and moissanite engagement rings are our specialty. Avita Jewellery is a Hatton Garden-based studio that creates personalised jewellery. Diamond and moissanite engagement rings are their specialties. Avita Jewellery is a bespoke jeweller with a studio in Hatton Garden, London. Our engagement rings are made of diamonds and moissanite.