The harmony of stone.
Independent gemmological expertise, sourcing and international connections.
GemAria supports professionals and enthusiasts in understanding, sourcing and enhancing the value of precious stones and diamonds.
Blue sapphire
Corundum · hardness 9Understand the stone before considering its value.André Lotellier · Gemmologist
A precious stone is more than its weight, its colour or its market price. It has an identity, an origin, characteristics and a story of its own.
GemAria is not simply a business that sells stones. It is an independent house that understands stones, identifies their potential and builds relationships between resources, professionals and markets.
A Swiss house of gemmology and trade, open to the world, on a human scale. Accurate information rather than excessive promises.
Three pillars, one standard
Gemstones are at the heart of GemAria. Gold and precious metals form a separate activity for professionals.
Gemmology
Knowledge, identification, observation and appraisal of stones.
- Gemmological expertise
- Professional opinion
- Advisory and support
Gem trade
International sourcing, supply, brokerage and trading of stones.
- Search on request
- Selection and verification
- Introductions and transactions
Precious metals
A separate activity for producers and refiners: mined gold, traceability, compliance.
- Mined gold supply
- Checks and documentation
- Delivery to Swiss refiners
Gemstones
Diamond, ruby, sapphire and emerald, long known as “precious stones”, but also spinel, tourmaline, garnet, opal and many more: all of them are gemstones. GemAria uses the current trade names and states the nature and treatments of each stone.
IllustrationRuby
- Hardness
- 9
- RI
- 1.762 – 1.770
- SG
- ≈ 4.00
IllustrationSapphire
- Hardness
- 9
- RI
- 1.762 – 1.770
- SG
- ≈ 4.00
IllustrationEmerald
- Hardness
- 7.5 – 8
- RI
- 1.565 – 1.602
- SG
- 2.67 – 2.78
IllustrationSpinel
- Hardness
- 8
- RI
- ≈ 1.718
- SG
- 3.58 – 3.61
IllustrationTourmaline
- Hardness
- 7 – 7.5
- RI
- 1.62 – 1.64
- SG
- ≈ 3.06
IllustrationGarnets
- Hardness
- 6.5 – 7.5
- RI
- 1.71 – 1.89
- SG
- 3.5 – 4.3
IllustrationOpal
- Hardness
- 5.5 – 6.5
- RI
- 1.37 – 1.47
- SG
- ≈ 2.15
IllustrationDiamond
- Hardness
- 10
- RI
- 2.417
- SG
- ≈ 3.52
Open to exchange, built on trust
From Lausanne, GemAria is an independent business open to international exchange. It works with suppliers, dealers, jewellers and buyers, in Switzerland and abroad, with the same discretion.
GemAria stones
Real stones, examined and photographed by GemAria.
Bicolour tourmaline, elongated emerald cut
Blue sapphire, cushion cut
Chartreuse tourmaline, emerald cut
Rubies, pear cut
Good to know
What does a gemmologist do?
They identify a stone (its nature, natural or synthetic), look for treatments and imitations, describe its characteristics and can value it.
How much does an examination cost?
The fee depends on the service and the number of stones. It is given before any work, without obligation.
Do I need a laboratory for a certificate?
For some valuable stones, an independent laboratory report is recommended. GemAria does not issue laboratory certificates and refers you to the right laboratory.
What is your activity in gold?
GemAria sources mined gold from producers and delivers it to Swiss refiners. This activity is for professionals only: no sale of bars or coins to the public.
How do you ensure gold traceability?
Through supplier identification, review of origin and export documents, due diligence in line with international standards and compliance with Swiss law.
Where do appointments take place?
In Lausanne, by appointment only. Travel within French-speaking Switzerland is possible on request.
Every stone has a story. Let’s discover yours.
A stone to understand, to find or to sell: write to GemAria. Every request is handled in strict confidence.