Buying directly from private sellers
What we buy and how to sell in Milan
Natural diamonds, valuable gemstones, rare vintage jewellery and selected watches. Free, no-obligation assessment: La Diamanteria makes the offer directly.
What we buy
Diamond jewellery
Solitaires and multi-stone jewellery, each with a dedicated assessment path.
Free quoteWe buy directly
ComproDiamanti.it is La Diamanteria's direct-buying service. We do not auction your diamond or offer it to a network of buyers. If it meets our criteria, we make the offer ourselves. One point of contact, a more straightforward process.
Who can sell
We buy directly from private sellers. Whether you inherited a jewel, own a loose stone or wish to sell a vintage piece, start with a free, no-obligation request.
What to prepare
Send clear photos and a GIA, HRD or IGI report if available. Uncertified diamonds are also considered. A valid ID is needed if the sale goes ahead.
How we assess
We review weight, colour, clarity and cut, as well as fluorescence, proportions, documentation and the jewellery's condition. Multi-stone items have their own questions; an initial request does not replace an in-person examination.
What affects the offer
Stones of equal weight can have very different values. Gem quality, treatments, documentation and the item's features all matter. We make our offer after verification.
At our premises and payment
If needed, we arrange an appointment at Via Vincenzo Monti 47, Milan, to examine your item. If you accept our offer, we pay by traceable bank transfer.
What we don't buy
- Diamonds under 1 carat per single stone
- Lab-grown or synthetic diamonds
- Diamonds with AIG, GRA, GWLAB or ALGT certificates
- Watches outside the brands we handle: Rolex, Patek Philippe, Audemars Piguet, Cartier, Vacheron Constantin, Richard Mille, Piaget and Jacob & Co
We also consider rubies, sapphires and emeralds under 2 carats. Multi-stone jewellery has a dedicated path in the form.
Frequently asked questions
I want to sell my diamond ring: who should I contact?+
A specialist diamond buyer. La Diamanteria has bought directly from private sellers in Milan since 2009: we assess the stone gemologically and, if it meets our criteria, make our own offer without auctions or intermediaries.
Which diamonds do you buy?+
We assess natural diamonds from 1 carat per single stone, with a GIA, HRD or IGI certificate or without a certificate. We do not buy lab-grown diamonds or diamonds graded by AIG, GRA, GWLAB or ALGT. We also assess rubies, sapphires and emeralds under 2 carats.
How quickly will I get a first valuation?+
For an immediate valuation, message us on WhatsApp or call +39 02 466891. You can also fill in the online quote form: one of our gemmologists will review your request, and the final offer follows an in-person examination of the stone.
Read all answers · Selling guides
Request your free quote