Diamond buyers · Kensington, London
Sell Diamonds in London
Request a specialist valuation for loose diamonds, certificated stones, diamond rings and diamond-set jewellery. We assess the stone and the whole item, including carat, cut, colour, clarity, certification, setting, brand and current resale demand.
How diamonds are assessed before an offer
The 4Cs provide a starting point, but certification, fluorescence, proportions, condition, setting, brand and current resale demand can also affect a buying valuation.
Accurate stone weight is a primary specification and should be taken from a reliable report or measurement.
Cut quality and proportions influence appearance and marketability, particularly for round brilliant stones.
Colour grading is assessed alongside stone type and certification where available.
Internal and external characteristics affect grading and can influence market value.
GIA, IGI and other recognised reports can help identify specifications, but a certificate is not always required to submit an enquiry.
A signed or desirable jewellery setting may add value beyond the loose-stone calculation.
Sell loose diamonds in London
Send the grading report number or a clear image of the certificate where available, plus photographs of the stone. If no report is available, submit the information you have and our team can advise whether an inspection is appropriate.
Do not value a signed piece as loose stones alone
Diamond rings, earrings, bracelets, necklaces and branded jewellery should be assessed as complete pieces. Maker, design, precious metal, gemstone arrangement, condition and resale demand can all be relevant.
For complete pieces, also see Sell Jewellery London.
How to sell to Imperial Time
Every specialist page feeds into the same Imperial Time valuation process.
Send details
Tell us what you have and upload clear photographs and available documentation.
Specialist review
We assess the relevant specifications, condition and current market factors.
Inspection
Authenticity, condition, testing and item-specific characteristics are confirmed where required.
Offer & payment
If agreed, the transaction is completed with the required documentation and bank-transfer process.
Send your item to our specialist team
The more accurate the information, the easier it is to identify the correct valuation route before inspection.
- Clear photographs
- Brand, model, reference or maker where relevant
- Hallmark, weight or certificate details where relevant
- Box, papers, receipts or service history if available
Call 020 3380 1542 or book a Kensington showroom appointment.
Request a valuation
Start online and a specialist can review your enquiry.
Sell in person at our Kensington showroom
79 Kensington Church Street, London W8 4BG. Booking ahead helps us make sure the appropriate specialist is available for your item.
Choose the most relevant valuation page
Questions before you sell
Can I sell a diamond without a certificate?
You can still submit an enquiry. A recognised grading report helps identify specifications, but our team can advise whether an uncertificated stone should be inspected.
What affects a diamond’s value?
Carat, cut, colour and clarity are core factors, alongside certification, proportions, fluorescence, condition, stone type and current resale demand.
How is payment made if I accept an offer?
Once an agreed transaction and required documentation are completed, Imperial Time uses bank transfer in accordance with its selling process.
Ready to request a specialist valuation?
Submit the item details online or arrange a visit to Imperial Time at 79 Kensington Church Street, London W8 4BG.