Fine jewelry ring set with a natural gemstone, hand-crafted in the SOSNA atelier

Jewelry with gemstones& diamonds.

MMXXVIPrague · Miami · Dubai · Bangkok

Every SOSNA Diamonds piece begins with a single certified natural gemstone or diamond. The setting is drawn to serve the stone — never the other way around. Executed in 18-karat gold and platinum 950 by our own atelier in Prague.

Begin a Piece Browse the catalog

Certified natural stones only
Master goldsmiths · in-house
18k gold & platinum 950
Discreet worldwide delivery

Independently verified by

Chapter IIDesign Philosophy

The setting is drawn to serve the stone.

SOSNA jewelry is not designed on a mood board. It is designed around a specific stone — its structure, proportions and natural character — and it is executed in one house, by hands we know by name.

The house sits at the intersection of two disciplines rarely combined: coloured-stone trading and fine goldsmithing. Every piece we sign inherits both — the stone chosen by a gemmologist, the setting drawn by a designer, forged by a master.

IThe stone leads — everything else adapts to it.
IIRestraint over ornament — proportion is the finish.
IIIOnly natural, only certified — never lab-grown.
IVExecuted by hand, in one house — no white-labelled workshops.

Chapter IIIBy the Numbers

A quiet workshop, measured by pieces — not campaigns.

A workshop sized to the pieces we accept. Every figure below is verifiable on request under NDA.

4–10w

Standard lead time

From confirmed piece to hand-over

House desks

Prague · Miami (FL) · Dubai DMCC · Bangkok JVC

Tier-1 laboratories

GIA · SSEF · Gübelin · IGI · HRD

1of1

Every signed piece

One stone, one design, one number

Lead times reflect standard pieces set with a stone from the house cabinet. Sourced-to-brief stones follow Private Sourcing timelines.

Chapter IVTwo Catalogs

Two catalogs. One house. All made to order.

Our jewelry is designed in-house and made to order. Every design in the catalog is ready to be executed with the stone you choose — lead time 4–8 weeks. For an original piece from scratch, see bespoke.

Catalog 1

Gemstone Jewelry

House designs built around a single certified natural colored stone — emerald, sapphire, ruby, Paraíba tourmaline. 18k gold and platinum 950.

Rings
Pendants
Earrings
Bracelets
Necklaces & Sets

Open the gemstone catalog →

Catalog 2

Diamond Jewelry

House designs for GIA-certified natural white diamonds. Solitaires, tennis bracelets, rivieres, studs. Platinum 950 and 18k white gold.

Rings
Pendants
Earrings
Bracelets
Necklaces & Sets

Open the diamond catalog →

Looking for an original design from scratch — with your own drawing and personal consultation with the designer?

Bespoke commission (1:1) →

Chapter VThe Principals

Two names are responsible for every piece that leaves the house.

The house is led by two principals working in tandem — one at the design bench, one at the stone counter. Every jewel is designed, sourced and signed by the same two people.

Lucia Sosna

Co-Founder & Principal Designer

Lucia leads design and atelier — from the first sketch and CAD study through to setting, finish and hand-over. Every SOSNA piece carries her drawing.

Trained between Central European ateliers and the Bangkok JVC bench, she treats each commission as a private dialogue between the wearer, the stone and the maker.

Principal designer — sketch to hand-set piece
In-house atelier — master goldsmiths since 2011
Author of every signed SOSNA design
Direct hand-over to private clients

Martin Sosna

Co-Founder & Principal · Stones & Trade

Martin leads stone selection, sourcing and the global trade desks. He is the person on the phone with Bangkok cutters, Dubai brokers and US wholesale counterparties.

A decade and a half between the coloured-stone counters of Bangkok's JVC, the trading floors of Dubai's DMCC and the US wholesale market out of Florida shaped a mandate that is deliberately narrow: fewer pieces, fully documented, fully owned.

GIA-trained gemmologist
ICA member — International Coloured Gemstone Association
Direct cutter relationships — Bangkok · Chanthaburi
US wholesale desk — Miami base

Chapter VIMaterials & Making

Two metals. Five stone families. One house standard.

We work exclusively with responsibly sourced precious metals and certified natural gemstones and diamonds. Every setting is drawn, forged, cast and finished within the house.

Metals

Platinum 950Cool white — our preference for coloured centre stones and diamonds.
18k white goldRhodium-finished or natural warm white.
18k yellow goldWarm champagne palette — the house signature.
18k rose goldSoft pink undertone for feminine pieces.

Stone families

EmeraldColombia · Zambia · Ethiopia
SapphireKashmir · Ceylon · Madagascar · Montana
RubyBurma · Mozambique · Madagascar
Spinel · Paraíba · Alexandrite · Tanzaniteand other rare collector stones on request
Natural diamondsGIA-certified · type IIa on request

Craft

Hand-drawn designSketch, gouache and CAD study by the principal designer.
Master settingMicro-pavé, invisible, prong and bezel — all in-house.
Bench finishPolished, rhodium-finished or matte by hand, never mass-tumbled.
Photo dossierProgress photography at each stage of production.

Chapter VIISelected Pieces

A quiet cabinet of recent one-of-one pieces.

A discreet selection from recent completions. Every design and stone is unique. The full catalog holds available, reserved and coming-soon pieces — all certified, all disclosed.

Engagement ring — private client
The Colombian Chapter
3.42 ct Colombian emerald · platinum · tapered baguettes

Anniversary earrings — Zürich
Rose Duet
Pair of 2.1 ct pink sapphires · 18k yellow gold · pavé halo

Heirloom pendant — private client
Kashmir Halo
4.87 ct oval Kashmir sapphire · platinum · diamond halo

Browse the jewelry catalog

Master goldsmith at the bench, setting a natural gemstone by hand

Chapter VIIIThe Atelier

Drawn, forged and set — by the same hands.

Every SOSNA piece is executed by a small team of master goldsmiths and setters we have worked with for more than a decade. No third-party workshops, no anonymous subcontractors.

The result is a signed piece with a single visual signature: quiet proportions, precise settings, and a stone that always keeps the last word.

In-house design

Sketch to CAD to bench in one studio.

Master setters

Micro-pavé, invisible & handmade prong work.

Only natural stones

No lab-grown, no synthesis — ever.

Full traceability

Photo dossier at every stage of production.

Chapter IXFour Desks

One atelier. Four accountable desks.

The Prague atelier is the heart of every piece. Three trade desks extend our reach and let us handle stones, memo and hand-carry across the markets we actually cover.

Four desks · One accountable house

Prague

Atelier · Europe HQ

Where every piece is designed, forged and finished. Client hand-over by appointment.

Miami (FL)

US wholesale desk

US-facing desk for vetted trade counterparties, memo, W-9 handling and hand-carry across the US calendar.

Dubai DMCC

Gulf & Asia treaty

DMCC-registered desk for Gulf and greater Asia — bonded, tax-free logistics.

Bangkok JVC

Coloured-stone lapidary

Jewelry Trade Center — direct sapphire, ruby and spinel cutter relationships.

Chapter XThe US Desk

Built for the United States private and wholesale market.

A dedicated US desk based in Florida for private US clients and vetted trade counterparties — retailers, designers, ateliers 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 from the same desk.

Florida base

US desk seated in Florida (Miami metro). Same-day domestic dispatch and secure client meetings by appointment.

Memo terms

Consignment memo to vetted trade 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.

Documentation

W-9 / resale certificate accepted. Full commercial invoice, laboratory report and provenance file with every piece.

Chapter XICertifications

Every centre stone is certified by a tier-1 laboratory.

Diamond centres are GIA-certified as standard. Coloured-stone centres carry an origin and treatment report from a tier-1 gemmological laboratory. Every SOSNA piece leaves the house with its stone's report and a signed house certificate.

Tier-1 laboratories

GIADiamond grading (4C) · origin reports
SSEFColoured-stone origin & treatment — Basel
GübelinColoured-stone origin & treatment — Lucerne
IGIDiamond & coloured-stone grading
HRDDiamond grading — Antwerp

SOSNA house certificate

Every signed piece is accompanied by a numbered SOSNA house certificate — piece number, stone identity, metal weight, principals' signatures. Filed permanently in the house registry.

SOSNA · MMXXVI · numbered

Certificate scans are shared only under NDA with named counterparties. The stone's original laboratory report is delivered with the piece at hand-over.

Chapter XIIFrequently Asked

SOSNA jewelry, in plain language.

Are all your stones natural?

Yes — without exception. SOSNA Diamonds trades exclusively in natural, certified gemstones and diamonds. We do not offer lab-grown or synthetic stones as an alternative, and this is a permanent house standard.

How is a SOSNA piece different from a boutique brand?

We are simultaneously the stone dealer, the designer and the atelier. There is no middleman between the mine and your finger. The two people who choose the stone are the same two people who sign the finished piece.

How long does a piece take?

Standard pieces from the house cabinet ship in 4–10 weeks depending on setting complexity. Custom variants and sourced-to-brief stones can extend the timeline; the exact schedule is set in writing before production begins.

Can I bring my own stone?

Yes. We regularly work around client-owned stones, family heirlooms and vintage pieces. We document the incoming stone, provide a fresh laboratory report if useful, and design around it with your input.

Do you ship internationally?

Yes — worldwide, by insured private courier. Customs, duties and documentation are handled by our team for the United States, EU, UK, Switzerland, Canada and the UAE as standard.

Can US retailers commission through the US desk?

Yes. The Miami desk handles US wholesale on memo terms, W-9 and resale certificates. Trade counterparties receive net wholesale pricing and can hand-carry pieces across US industry weeks.

What documentation ships with the piece?

Every piece ships with (i) the stone's original laboratory report from GIA / SSEF / Gübelin / IGI / HRD, (ii) a numbered SOSNA house certificate signed by both principals, and (iii) a written statement of provenance.

Chapter 13Begin a Piece

Tell us about the piece you have in mind.

Share as much or as little as you like. Your advisor will reply personally within one business day — no automated funnels, no follow-up campaigns.

General inquiries
exchange@sosnagems.com
Corporate office
office@sosnagems.com
Telephone (US)
+1 (727) 383-6970
Telephone (EU)
+420 242 488 299

Advisor response within 24 hours on EU / US business days.

SOSNA Diamonds trades exclusively in natural, certified gemstones and diamonds. No lab-grown or synthesized stones — ever. Jewelry is offered as an object of beauty and craftsmanship, not as a financial instrument.