Adiamor

Adiamor lets you search through more than 200,000 diamonds and either buy a stone loose or have it mounted in one of its custom settings for a ring, pendant or pair of earrings. The diamonds are graded by GIA and IGI, and the Design Your Own tools are built so you choose the stone first and the setting second. Both natural and lab-grown diamonds are sold, and the site is clear that a lab-grown stone is a diamond grown in a laboratory rather than in nature.

The education section walks through the four Cs one at a time, covering cut, colour, clarity and carat weight, and gemologists are available to help if you get stuck on a comparison. Adiamor states a zero-tolerance policy on conflict diamonds and lists ethically sourced stones, including a Canadian-origin line. For a Zurich buyer working from a distance, that combination of a large certified inventory and a build-your-own approach makes it straightforward to compare stones before committing.