Loose Diamonds for Sale in the UK
Loose diamonds for sale across the UK — certified stones from GIA and IGI with carat, cut, colour and clarity recorded on every advert.
Quick answer
How much do Loose diamonds cost in the UK?
Loose diamonds typically sell for £100–£20,000+ in the UK on the second-hand market. Sellers are ID-verified before advertising on JewelleryTrader, and every piece should carry a checkable hallmark or certificate — Loose pieces normally hold their value well when diamond is the hardest natural material — condition issues are rare; chips happen at the girdle.. Always verify the hallmark and any certificate number before paying.
- Typical price
- £100–£20,000+
- Durability
- Diamond is the hardest natural material — condition issues are rare; chips happen at the girdle.
- Size
- Carat weight plus exact measurements in millimetres stated on the certificate.
- What to check
- Verify the report number on the GIA or IGI website and confirm the stone's measurements match exactly.
Live Loose listings in the UK
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About the Loose
Style & Character
Certified and uncertified loose diamonds — the certificate is the product here, so GIA or IGI paperwork is essential for anything of value.
Size
Carat weight plus exact measurements in millimetres stated on the certificate.
Durability
Diamond is the hardest natural material — condition issues are rare; chips happen at the girdle.
What to Check
Verify the report number on the GIA or IGI website and confirm the stone's measurements match exactly.
Care
Keep sealed in its certificated packet until set.
Best Suited To
Buyers having a ring or pendant made, and investors.
What to know before buying a Loose in the UK
- •Certification verifiable online
- •Price driven by the 4 Cs
- •Ideal for custom commissions
- •Always inspect the piece in person, or ask for detailed close-up photos and video, before paying a deposit.
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Advertise your businessLoose buying questions
How much do Loose diamonds cost in the UK?+
Loose diamonds typically sell for £100–£20,000+ on the second-hand market. Condition, hallmark, certification, and whether the original box and papers are included all move the price. A price far below the normal range is one of the clearest warning signs of a problem — always verify hallmarks and certificates before paying.
What should I check before buying Loose diamonds?+
Check the hallmark against UK Assay Office records, verify any GIA or IGI certificate number online, and ask for clear close-up photos of any marks, serial numbers and wear. Meet in person where possible, and keep all messages and payment records inside JewelleryTrader.
Where can I find Loose diamonds for sale near me?+
Browse the live Loose adverts on this page, then filter by your county or town to find sellers close to you. New Loose adverts are posted on JewelleryTrader by jewellers, dealers and private sellers every week.