The diamonds are formulated in a dedicated house and replicate exactly what occurs in nature—except for the mining practices. Vrai makes their diamonds from greenhouse gasoline crystallized in its San Francisco foundry, and presents an especially broad number of styles from solitaire necklaces to stud earrings to tennis bracelets. The buying experience is elevated and elegant, which makes searching very tempting. For many of the previous 20 years, these figures have been reversed, with silver jewelry outselling gold jewellery.

• The return window varies from brand to model, with Quince offering the most flexibility by far with free returns for three