diamond necklace

Sell My Diamonds

Buyers of jewellery, fine art, Antiques & watches

Free Diamond Valuation

At Olympia Mayfair, we are experts in buying loose or gem set jewellery.

You will receive a better price for your loose diamonds and gemstones when selling through us rather than through an auction because, unlike the auction houses, there are no fees incurred when selling through us. We offer a free, no-obligation quote, so why not find out how much your loose gemstones are worth?

diamond Ring with gemstones

Our Experts

We have 30 years of experience buying and selling diamonds and gemstones

Sell Your Diamonds Privately

We offer a safe and secure process and ensure that maximum prices are paid. You’re in safe hands with Olympia Mayfair’s expert valuers.

Sell Diamonds and Gemstones

There’s no obligation to sell if you receive a free valuation from us. We purchase gemstones loose or set jewellery throughout the United Kingdom while ensuring a compassionate and convenient service for anyone looking to sell diamonds or gemstone set jewellery.

Antique Diamond Rings

Our antique diamond ring buying service is designed to make it easy to sell your jewellery, knowing you’re receiving an accurate valuation.

antique diamond ring
single loose ruby gemstone

Loose or Set Diamonds & Gemstones

We buy diamonds, loose or set in a mount. Once we have determined the four ‘c’s we will provide you with the highest valuation which is unachievable at auction as there are no fees to be deducted from the value. We also buy quality precious stones such as emerald, sapphire, ruby, emerald, and aquamarine.

Contact us for all your diamonds and gemstones. We are experts in set and loose diamonds and gemstones. 

Free Valuations

We have a dedicated team of specialists in Diamonds with 30 years of experience and knowledge in diamond grading. If you have any diamond jewellery or loose set diamond, we will offer a high level of service and a free no obligation valuation. We will provide you with extensive information about your gemstone on its Cut, clarity, colour, carat weight and certificate of the gemstone; this information is important in determining your gemstone’s value.

unset diamonds
diamond brooch

Diamond Jewellery

Do you have any antique, vintage, or modern diamond jewellery you wish to sell? We have a detailed knowledge of market trends and can pay the highest price for all unwanted diamond jewellery

We provide a discreet and secure private buying service.

GIA diamond certificates

Discretion & Security

Our reputation is built on a solid foundation of experience, professionalism, trust, and transparency. Our private buying service is an extremely economical alternative when selling to an auction house. We offer an honest and fair appraisal of loose or set diamond jewellery. We are known for paying the highest prices, as we have a database of private collectors, private buyers, and a handful of specialist dealers. 

Absolute discretion and security are always paramount.

We Buy All Diamonds and Gemstones

Olympia Mayfair offer a comprehensive service for anyone looking to sell diamonds and other gemstones, including:

Contact us today for a free no-obligation valuation to find out how much your diamonds and gemstones are really worth. Our expert valuers with over 30 years of industry experience ensure you secure the best possible offer for your valuable items. 

No Fees

Highest Prices paid for your valuables

No Premiums

Free Diamond & Gemstone Valuation

We offer free, no obligation valuations of all diamonds and gemstones. Just fill out the form below to receive a quick and easy price for your items.

Our Process


Guide Price

By filling in our free valuation form, you will receive an expert opinion on a guide price for your item. There’s no obligation by filling out the form, and there’s no fees incurred when using Olympia Mayfair to sell your items.


Free Valuation

The guide price will give you an idea of item value, but in order to really be 100% sure of an items value, we need to come out and see the item in person. We do this completely free of charge, and no obligations.



Once we’ve valued your item we will offer you that amount in full, with immediate payment. It’s absolutely fine to not accept this offer, or to take some time to think about the offer before accepting. We will be ready to purchase whenever suits you.

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