A certified diamond — graded by a trusted laboratory — guarantees its claimed attributes (the 4 Cs, natural or lab-grown). London Jewels Magazine Without certification, a too-good-to-be-true price is often a warning sign. Certification protects you from misleading deals or misrepresented stones. https://londonjewelsmagazine.blogspot.com/2025/11/smart-ways-to-buy-diamond-jewellery.html