A ‘Moon and Star’ diamond dress ring by Adler, 2000, composed of five tapered bands, joined to the reverse, the front set throughout with brilliant-cut diamonds in a variety of heart, star, crescent moon, and round collets, signed ‘adler’, 18ct white gold, London hallmark, ring size P. £1,000-£1,500

Adler are a fifth generation family jewellers. In 1886, Swiss-born Jacques Adler, after training as a jeweller in Vienna, opened a workshop in Istanbul, bringing together Eastern and European influences. The company continued as a family business over the decades. In 1970, the founder’s grandsons Franklin and Carlo Adler returned to their family’s historical roots, opening a boutique in Geneva.