Loose Diamonds for Sale in London
The UK's largest jewellery market, with jewellers, dealers and private sellers across all 32 boroughs. 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 London?
Loose diamonds typically sell for £100–£20,000+ in London 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 London
No Loose adverts are live right now. Check back soon, widen your search — or list one yourself.
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Buying a Loose in London
Loose adverts in London come from local dealers, jewellers and private sellers, who are asked to complete a photo ID and live selfie check — look for the Verified badge. Typical prices sit around £100–£20,000+, and demand in and around London means good pieces are often sold quickly — message the seller through JewelleryTrader rather than paying a deposit off-site.
Check the seller's badges
Look for Verified, Registered Dealer or Insured badges on London adverts — each one is confirmed by our team against uploaded paperwork.
View before you buy
Where possible, view the diamonds in person and check the hallmark and condition yourself. Never meet at a car park, station or motorway services near London.
Ask for paperwork
Request the certificate number, hallmark details and receipt or provenance if the seller is a registered dealer in London.
Set your travel radius
Use the distance filter with your postcode to see Loose adverts within 10, 25 or 50 miles of London instead of scrolling the whole country.
Budget beyond the price
On top of the £100–£20,000+ purchase price, plan for insurance and any resizing or servicing costs — ongoing costs in London are usually higher than rural areas.
Pay safely
Keep conversations in JewelleryTrader messaging, never pay by bank transfer to hold a piece you haven't seen, and report anything that feels wrong to our team.
Read the full jewellery buying safety guide or browse all jewellery for sale in London.
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 London
- •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.
Are there Loose diamonds for sale in London right now?+
Live Loose listings in London are shown at the top of this page. Availability changes regularly, so check back or widen your search to nearby areas if nothing is listed today.
Can I view a Loose in person before buying near London?+
Yes — where possible, arrange to view the piece in person so you can check the hallmark and condition yourself before paying. If that is not practical, ask the seller for clear close-up photos and video, and keep payment inside JewelleryTrader.
Are Loose sellers in London checked by JewelleryTrader?+
We ask every seller advertising in London to complete a photo ID and live selfie check, and sellers add their trading history and certification details. Accounts reviewed by our team carry badges such as Verified, Registered Dealer and Insured.