Diamond Concierge
The confidential sourcing of the finest stones
AC PRIVATE identifies, authenticates and acquires the world's finest stones for you — rare diamonds, fancy vivids, collectible and investment precious stones — in complete confidence, from the search to hand delivery.
The art of the rare stone
An exceptional stone is not bought, it is found
The world's most beautiful stones change hands far from the shop windows, between insiders, in the secrecy of diamond bourses and family vaults. Acquiring an exceptional diamond demands a network, independent expertise and unwavering discretion. AC PRIVATE becomes your trusted eye: we search, authenticate and negotiate on your behalf, so that every stone lives up to its legend — and to your estate.
A complete service, from search to hand delivery
Unsere Expertise
Confidential sourcing
Identification and acquisition of exceptional diamonds through a worldwide network of certified dealers, historic diamond bourses (Antwerp, Tel Aviv, Mumbai) and the greatest high-jewellery houses. We access stones that never appear on the public market.
Certification & expertise
Every stone is certified by the most recognised laboratories — GIA, HRD or IGI. Independent 4C expertise (carat, colour, clarity, cut) and rigorous verification of ethical provenance under the Kimberley Process.
Investment diamonds
Investment diamond advisory: rare fancy vivid colour stones, large Type IIa carats of exceptional purity, diamonds with documented history. Discreet wealth guidance, alongside your advisors.
Bespoke high jewellery
Creation of unique pieces with the finest setters, jewellers and goldsmiths: rings, necklaces, complete parures. From the first sketch to hand delivery, complete and perfectly confidential guidance.
Negotiation & confidentiality
Discreet negotiation conducted on your behalf, absolute protection of your identity and secure structuring of the acquisition. Every transaction is protected end to end, in the utmost secrecy.
Worldwide delivery & insurance
Insured transport by specialist couriers, hand delivery, insurance and conservation advice — high-security safe, bespoke presentation case and full documentation.
What defines an exceptional stone
The rigour of the 4C
Carat, colour, clarity and cut: the four criteria that together make the value and fire of a diamond. To these 4C we add two essential dimensions — ethical provenance and historic rarity — so that every acquisition is both a jewel and a lasting investment.
Carat
Weight and presence
Colour
From colourless D to fancy vivid
Clarity
Analysis of inclusions
Cut
The art that reveals the fire
Four steps to your exceptional stone
Unser Prozess
Brief & requirements
A strictly confidential consultation to define the desired stone, your quality and provenance criteria, and the framework of the acquisition.
Sourcing & shortlist
Activation of our international network and presentation of a certified shortlist, matching your requirements precisely.
Expertise & authentication
Independent verification (GIA, HRD, IGI), fair market value estimate and a detailed expertise report provided in full transparency.
Acquisition & secure handover
Final negotiation, secure transfer, insurance and full documentation. Hand delivery, wherever you are.
GIA · HRD · IGI
Recognised certifications
4C
Independent expertise
100%
Guaranteed confidentiality
Worldwide
Secure delivery
Discretion & NDA from the first exchange
Independent & certified expertise
A single point of contact from A to Z
Your next exceptional stone
Entrust us with your search. We will propose a strictly confidential consultation, with no obligation whatsoever.