Round Brilliant Natural Diamond Side Stone Engagement Rings in 18K Yellow Gold Under £4,000

The natural round brilliant is the quintessential engagement ring diamond — the combination of geological rarity, unmatched brilliance, and timeless appeal. Formed over billions of years and cut to mathematical perfection, it is the choice for those who want nothing less than the original.

The round brilliant cut features 58 precisely arranged facets mathematically optimised to maximise light return, fire, and scintillation. Accounting for over 60% of all engagement rings sold worldwide, the round brilliant is the most researched and refined diamond shape in existence. Its symmetrical silhouette offers unmatched sparkle from every angle.