The World ofSOSNA Diamonds
A curated house for certified natural gemstones and natural diamonds — sourced discreetly, verified independently, and presented to a small circle of collectors, ateliers, family offices and vetted US wholesale counterparties.
One standard. Nature only. Documented always.
SOSNA Diamonds exists to remove ambiguity from the acquisition of exceptional stones. We deal exclusively in natural gemstones and natural diamonds — never lab-grown, never treated beyond disclosed industry norms, never presented without an independent laboratory report from a recognised authority.
Every piece we release is chosen for what it is, not for what a market cycle rewards. We would rather present ten stones in a season than a hundred that pass a lesser bar.
- INatural origin only — no lab-grown material.
- IIIndependent laboratory report — GIA · SSEF · Gübelin · IGI · HRD.
- IIIFull disclosure of any accepted treatment.
- IVSourced by mandate, not by inventory pressure.
A house measured in decades, not campaigns.
A quiet operation, sized to the mandates we accept. Every figure below is verifiable on request under NDA.
- 15+Years in the tradeCombined principal experience
- 4House desksPrague · Miami (FL) · Dubai DMCC · Bangkok JVC
- 5Tier-1 laboratoriesGIA · SSEF · Gübelin · IGI · HRD
- < 24hAdvisor responseWeekday, business hours EU / US / GCC / SEA
Figures reflect combined principal experience and active trade relationships. Full references available under NDA to qualified counterparties.
From the primary market to the private cabinet.
Our reach begins at the origin — the mines and primary cutters of Colombia, Mozambique, Sri Lanka, Madagascar, Myanmar, and Botswana — and is anchored by four house desks: Prague (Europe HQ), Miami (US wholesale, Florida), Dubai DMCC (Gulf & Asia treaty) and Bangkok JVC (coloured-stone lapidary). What arrives to our clients has already passed through cutters, graders and gemmologists we have known for years.
Origin
Direct relationships with primary cutters and lapidaries; auction acquisitions from estates and single-owner sales.
Verification
Every principal stone is submitted to — or arrives already accompanied by — a report from a Tier-1 gemmological laboratory.
Cabinet
The final selection reaches the client accompanied by full documentation, provenance narrative and, where relevant, historical context.
One name is responsible for every stone that leaves the house.
The house is led by a single principal responsible for every mandate accepted, every stone released, and every client relationship. There are no sub-agents, no white-labelled desks and no anonymous intermediaries.
A decade and a half between the coloured-stone counters of Bangkok's JVC, the Gulf trading floors of Dubai's DMCC and the US wholesale market out of Florida shaped an approach that is deliberately narrow: fewer stones, fully documented, fully owned.
- GIA-trained gemmologist
- ICA member — International Coloured Gemstone Association
- Rapaport RapNet authorised
- Insured, bonded and audit-ready operations
What we accept — and what we refuse.
Four rules that govern every stone we release. They are absolute.
“Ten stones a season, chosen over a hundred that pass a lesser bar.”
Four desks. One accountable house.
We operate from four house desks — one per region we actually cover. We do not claim cities we do not sit in. Each desk is staffed by principals we have worked with for years.
- 01PragueEurope HQ · atelier & advisoryHouse headquarters — client cabinet, final release, European advisory.
- 02Miami (FL)US wholesale deskUnited States wholesale, memo terms, hand-carry across the US trade calendar.
- 03Dubai DMCCGulf & Asia treatyDMCC-registered desk for Gulf, India and greater Asia — bonded, tax-free zone.
- 04Bangkok JVCColoured-stone lapidaryJewelry Trade Center — direct relationships with sapphire, ruby and spinel cutters.
One house — six disciplines.
Each vertical is curated by a dedicated principal. Nothing is outsourced beyond independent gemmological assessment.
A small circle, addressed personally.
We do not scale by adding clients. We scale by deepening service to those already inside the house.
Private Collectors
Individuals building a considered, multi-decade cabinet of coloured stones and diamonds.
Family Offices
Advisors and principals holding tangible assets alongside financial portfolios — with full documentation.
Ateliers & Houses
Independent jewellers and maisons that require a discreet, reliable supply of principal stones.
US Wholesale
Vetted trade counterparties in the United States acquiring principal stones for their own clientele.
Built for the United States wholesale market.
A dedicated US desk based in Florida for vetted US trade counterparties — retailers, ateliers, designers and appraisers. Terms familiar to the American trade, execution familiar to the European maison.
- Miami (base)
- JCK Las Vegas
- AGTA Tucson
- Couture
US Wholesale is a trade-only channel. Retail collectors are served through the Private Advisor.
- I
Florida base
US desk seated in Florida (Miami metro). Same-day domestic dispatch and secure client meetings by appointment.
- II
Memo terms
Consignment memo to vetted counterparties on a per-piece basis. Standard 7–14 day windows, extendable by written agreement.
- III
Hand-carry
Insured hand-carry across the US trade calendar — travel to client cities on defined show weeks and by appointment.
- IV
Documentation
W-9 / resale certificate accepted. Full commercial invoice, laboratory report and provenance file with every piece.
Show presence
Attending select US industry weeks — JCK Las Vegas, AGTA Tucson, Couture. Private preview by appointment.
Confidentiality is a service, not a slogan.
Every mandate — sourcing, sale, acquisition — is handled under a strict internal protocol. Nothing is discussed outside a defined circle.
Named principals only
No sub-agents. You speak with the same person from first contact to final release.
Written mandates
Every engagement is defined in a written brief — scope, budget, timeframe, exit.
Sealed logistics
Insured, sealed transport through vetted couriers; hand-carry available in-region.
No public inventory disclosure
Stones released to a client are removed from any presentation surface immediately.
Where the house is known.
A short list of channels where our work, our people or our stones have been referenced. We do not chase press — we do not decline it either.
- Rapaport
- JCK Magazine
- National Jeweler
- GemGuide
- The Jewellery Editor
- ICA — International Coloured Gemstone Association
- AGTA — American Gem Trade Association
- RapNet authorised member
- Responsible Jewellery Council — application in progress
Logos and citations are added only once written permission is on file. Placeholders shown pending confirmation.
Provenance is not a marketing line.
We work only with cutters, lapidaries and auction channels whose chain of custody we can articulate. Where a jurisdiction or a source cannot be documented to our standard, we decline the material — regardless of price or availability.
This is why our inventory is deliberately narrow and why our lead times are honest. A stone we cannot describe with full confidence is a stone we do not offer.
- Documented primary-market rough with named cutter
- Auction acquisitions with full provenance file
- Estate stones with legacy paperwork and, where required, re-certification
- Kimberley Process compliant rough diamonds
- Any lab-grown or synthetic material
- Undisclosed treatments beyond industry-accepted norms
- Material from jurisdictions we cannot document
- Any stone whose chain of custody is broken or ambiguous
The next step is a conversation.
Whether you are opening a sourcing mandate, considering a house piece, or simply wish to understand how we work — the entry point is the same: a private advisor.
- General inquiriesexchange@sosnagems.com
- Corporate officeoffice@sosnagems.com
- Telephone (US)+1 (727) 383-6970
- Telephone (EU)+420 242 488 299
SOSNA Diamonds is not a financial adviser. Gemstones and diamonds are not offered as investment products with guaranteed return; any reference to store-of-value language reflects long-term market recognition of certified natural material — never a promise of appreciation.