Vivid
01Highest saturation, alive across the room. The stone the market remembers.
House Chapter IColored Gemstones
Colored gemstones,read as objects of study.
Emeralds, rubies and sapphires — natural, untreated where possible, always accompanied by an independent laboratory report. Each stone is examined in hand before it enters the cabinet of the house.
Assurance of the house
- SSEF · Gübelin · GRS · AGL reports
- Origin & treatment disclosed in writing
- Fully insured worldwide delivery
- 14-day risk-free examination period
- Natural stones only — no synthetics
Independently verified by
Chapter IIThe Gemstone Register
Plate ISenior Gemologist · House of SOSNA Diamonds
Chapter IThe House Standard
Natural. Documented. Admitted, not acquired.
A colored stone is judged first as a natural object — its color, its cutter's decisions, its country of origin — and only then against a laboratory report. Nothing enters the cabinet on paper alone.
- 01
Natural origin only
No synthetic, no lab-grown, no imitation. Only natural stones, always.
- 02
Treatment transparency
Every heat treatment, oil or filling disclosed in writing on the invoice — including its absence, which is often the point.
- 03
Origin on the record
Colombian emeralds, Burmese and Mozambican rubies, Kashmir and Ceylon sapphires — origin documented by an independent lab.
- 04
Color before size
Saturation, tone and life read across the room. Carat is a consequence of quality, never its objective.
Chapter IIThe SOSNA Diamonds Assurance
Five commitments that travel with every stone.
Buying a natural gemstone is an act of trust. The house makes that trust explicit — the same protections apply to a first collector and to a returning private client.
- 01
Independent laboratory report
SSEF, Gübelin, GRS, AGL or GIA — the report leaves with the stone, in original form.
- 02
Written disclosure of treatment
Heat, oil, filling — or their absence — stated on the invoice itself, not in a footnote.
- 03
14-day quiet examination
Study the stone at home, under your own light, with your own advisors. Full refund, no questions.
- 04
Fully insured worldwide delivery
FedEx Priority / Brinks, door-to-door, insured to full replacement value at the house's cost.
- 05
Buy-back & consignment
The house will always quote to repurchase or place its stones on private consignment for existing clients.
Nothing in this section constitutes financial advice or a guarantee of appreciation.
Chapter IIIEvery Stone Includes
What arrives at your door.
A stone from the cabinet is never delivered alone. Six items travel with it — the paperwork you expect, and the small rituals that make ownership feel considered.
- I
The stone itself
In its dedicated cotton-lined case, seal intact.
- II
Independent laboratory report
Original document from SSEF, Gübelin, GRS, AGL or GIA.
- III
Origin & treatment letter
House statement, signed, restating what the lab and invoice already say.
- IV
Provenance card
Compact record — cutter, region, year, entry to the cabinet.
- V
Insurance & shipping dossier
Full insured value declared; tracking held privately.
- VI
SOSNA Diamonds presentation case
Discreet, without exterior branding — for the collector, not the vitrine.
Chapter IISignature Families
The five voices of the cabinet.
A short vocabulary of natural species the house works with most closely. Each family is presented with its origin, character and where it belongs in a collection.
Chapter VReading Color
The color ladder, in four rungs.
The house grades color before it grades size. Four descriptors are used consistently across every species — a simple vocabulary shared with the client.
Intense
02Full saturation with slightly softer tone. Extremely wearable, collector-relevant.
Deep
03Darker tone, dense pigment. Formal, evening character.
Pastel
04Lower saturation, luminous transparency. Contemporary and delicate.
Grades are house descriptors used alongside — not in place of — the independent laboratory color language.
Chapter VHouse Atlas
The map behind the cabinet.
Six regions, six long-standing relationships. The atlas is not marketing — every pin corresponds to a partner the house has worked with for years.
Plate IIIProvenance AtlasSOSNA Diamonds · House network
Illustrative locations — indicative only, not a geopolitical map.
- COMuzo · ChivorEmerald
- MMMogokRuby · Sapphire
- MZMontepuezRuby
- LKCeylonSapphire
- INKashmirSapphire
- MGIlakaka · MerelaniSapphire · Tanzanite
Provenance Ledger
From mine to cabinet, on the record.
Every stone the house admits has a documented path. Four stages, each with a name, a place and a date — the ledger travels with the stone for its entire life.
- Stage I
Mine of origin
Country, region and, where possible, the specific mining office. Colombian Muzo, Burmese Mogok, Mozambican Montepuez.
- Stage II
Cutter's atelier
The workshop that read the rough and made the decisions. Named where the cutter permits.
- Stage III
Independent laboratory
SSEF, Gübelin, GRS, AGL or GIA — country of origin, treatment, dimensions and weight, on record.
- Stage IV
SOSNA Diamonds vault
Photographed, weighed and logged into the house cabinet before offer. Every stone has an internal reference.
Chapter VIIIndicative Ranges
What things actually cost.
Price is a function of color, origin, treatment and clarity — never of size alone. The ranges below are indicative starting points for reference-quality material; every individual stone is quoted personally.
Species
Carat band
Indicative USD / ct
Reference quality
- 01Colombian Emerald3 – 5 ct$18,000 – $65,000 / ctMinor oil, Muzo — SSEF or Gübelin
- 02Burmese Ruby (no heat)2 – 4 ct$45,000 – $180,000 / ctPigeon-blood saturation, Mogok
- 03Kashmir Sapphire3 – 5 ct$60,000 – $220,000 / ctVivid velvet blue, SSEF origin
- 04Ceylon Sapphire (no heat)3 – 6 ct$3,500 – $18,000 / ctCornflower, royal or fancy tones
- 05Mozambique Ruby (no heat)2 – 5 ct$8,000 – $45,000 / ctVivid red, Montepuez
- 06Tanzanite AAA5 – 15 ct$900 – $2,400 / ctVivid violet-blue, Merelani
USD, ex-VAT, indicative only — not an offer. Final quotation depends on the individual stone and its documentation.
Chapter IVHow to enter the cabinet
Three routes into color.
From investment-grade discipline to the singular collector's stone, choose the path that best matches your intention.
I
Investment stones
Emerald, ruby and sapphire in classic proportions, unheated where quality permits, with SSEF / Gübelin / GRS reports.
II
Collectors' rarities
Fine origin (Kashmir, Muzo, Mogok), unusual colors, historically significant material.
III
Bespoke commission
Stones sourced privately to a specific brief — species, origin, size, color and budget.
Chapter VIIRecent Acquisitions
Just landed in the cabinet.
A short list of stones most recently admitted by the house. Some are already reserved; the ledger is updated weekly.
Just landedColombian Emerald
Muzo, Colombia
- Carat
- 3.42 ct
- Lab
- SSEF
No heatBurmese Ruby
Mogok, Burma
- Carat
- 2.11 ct
- Lab
- Gübelin
On holdReserved / on holdKashmir Sapphire
Kashmir, India
- Carat
- 4.06 ct
- Lab
- SSEF
Just landedTanzanite
Merelani, Tanzania
- Carat
- 8.44 ct
- Lab
- AGL
Chapter XCollector Voices
Read by those who returned.
Three notes from clients who allowed us to share them, anonymized to protect their privacy — as every SOSNA Diamonds relationship remains.
“The Muzo emerald arrived exactly as it was described on the video call — and the SSEF report was in the case, not promised for later. That is rarer than the stone itself.”
Private collector
New York, NY
“I asked for an unheated Burmese ruby above three carats. Three months, one honest email a week, and a stone I would not have found on any showroom floor.”
Family office
Zurich
“What I paid for was documentation and discretion. What I received was a gemologist who called me back on a Sunday to walk through the Gübelin report line by line.”
Bespoke jewelry house
Los Angeles, CA
For US Clients
Buying from the United States, plainly.
The house ships regularly to New York, Los Angeles, Miami, San Francisco and Palm Beach. Everything is handled from Prague — you do nothing but sign for the parcel.
- 01
USD pricing on request
Any stone can be quoted in USD; the exchange rate is fixed on the pro-forma invoice for 72 hours.
- 02
Fully insured door-to-door
FedEx Priority International or Brinks, insured to full replacement value at the house's cost.
- 03
No US sales tax on the invoice
SOSNA Diamonds invoices out of the European Union; US sales / use tax remains the client's obligation as applicable.
- 04
Duties handled on request
The house can act as importer of record and settle US duties on behalf of the client, or ship DDU — your choice.
- 05
Bank wire above $25,000
Card payments accepted up to USD 25,000 for approved clients; wire transfer for anything above, against a written pro-forma.
- 06
14-day quiet examination
Study the stone in your own light, with your own advisors. Full refund inside 14 days, no questions.
Chapter VIIIConcierge Answers
The questions collectors ask first.
Nine answers the house gives most often, kept short. Every other question is welcome — a senior gemologist will answer in person.
Do you ship internationally, and to the United States?
Yes. Fully insured, door-to-door via FedEx Priority or Brinks, from Prague to any address worldwide. All duties and import formalities are handled by the house on request.
What does “no heat” actually mean?
It means the ruby, sapphire or spinel has never been thermally enhanced. It is verified by an independent laboratory (SSEF, Gübelin, GRS, AGL). Unheated stones are considerably rarer and are always declared on the report and on the invoice.
How do you verify a Kashmir, Muzo or Mogok origin?
Origin on high-value colored stones is confirmed by trace-element analysis and inclusion study at a first-tier laboratory — SSEF, Gübelin or GRS. The house accepts these origin calls only when they appear on the original report; regional attributions without a lab statement are never used.
Will an emerald need re-oiling over time?
Colombian emeralds are traditionally stabilized with cedar oil, and this treatment can gently fade after years of wear. Routine re-oiling by a qualified workshop restores clarity without altering the stone. The house arranges this service for its clients, at cost.
How do payments above USD 25,000 work?
Above USD 25,000 the price is quoted individually and settled by bank transfer against a pro-forma invoice. Card payments up to USD 25,000 are accepted for approved clients.
Can I have the stone independently re-appraised in the United States?
Yes — and it is encouraged. On request the house recommends a GIA-affiliated appraiser in your city; the 14-day examination period is extended to accommodate a written independent appraisal before you decide.
Can I return a stone if it is not right for me?
Yes. Every acquisition includes a 14-day quiet examination period — study the stone at home, in your light, with your advisors. Full refund, no questions.
Can I place a stone on hold before deciding?
Yes. A stone can be placed on private hold for up to seven days while paperwork, appraisal or a viewing is arranged. Longer holds by written agreement.
Do you deal in laboratory-grown or glass-filled material?
No. The house trades only natural gemstones and natural diamonds. Laboratory-grown, synthetic, imitation and glass-filled material is never offered — under any circumstance.
Chapter IXThe Gemologist
The person on the other end of your email
One gemologist. Every stone. Every enquiry.
Enquiries at SOSNA Diamonds are not routed. They are read, priced and answered by the same senior gemologist who examined the stone in the first place — always in strict confidence.
G.G. · GIA
Head of Gemology
SOSNA Diamonds · Prague
“I would rather refuse a beautiful stone with an ambiguous origin than sell it. Every gem in the cabinet has passed through my hands — that is the only guarantee that matters.”
- G.G. — Gemological Institute of America
- 20+ years in colored stones & natural diamonds
- Origin & treatment specialist (Colombia, Burma, Kashmir)
- Direct client line for private acquisitions