Precious Gemstones
Ruby, Sapphire & Emerald
At Diago Switzerland, our core focus lies in investment-grade diamonds and precious metals. Yet the world of fine gemstones also includes rare coloured stones that embody heritage, precision and long-term value.
This section presents three of the most esteemed coloured gemstones: ruby, sapphire and emerald — each selected with the same rigour, transparency and expertise that define our diamond practice.
Ruby
A Stone of Passion and Nobility
Rubies are among the most coveted gemstones in the world. Their vivid red colour is created by traces of chromium within the crystal structure, lending each stone exceptional depth and character. The finest rubies originate from Myanmar, Mozambique and Thailand, appreciated for their colour saturation, clarity and durability.
At Diago Switzerland, we apply strict standards of origin, quality and certification — identical to those used for our diamonds.
Key Attributes
- Colour range from pinkish red to the rare “pigeon blood” hue
- Hardness: Mohs scale 9
- Symbolism: vitality, passion, protection
- Ideal for bespoke creations and collector-grade pieces
Sapphire
Timeless Elegance in Every Shade
Sapphires are renowned for their royal blue tones, yet their palette extends far beyond — from deep velvety blues to soft pastels and rare pink or yellow varieties. Sapphires from Sri Lanka, Kashmir and Madagascar are particularly prized for their depth and luminance.
Our selection criteria focus on colour purity, cut precision and full traceability from origin to final piece.
Key Attributes
- Second hardest gemstone after diamond
- Extensive colour spectrum
- Exceptional brilliance and optical performance
- Ideal for high-jewellery designs and investment-focused pieces
EMERALD
The Icon of Green Luxury
Emeralds captivate with their rich green colour and characteristic internal features — the “jardin” — which provide each stone with individuality and natural charm. The most renowned emeralds come from Colombia, Zambia and Brazil, known for their intensity and rarity.
Every emerald selected by Diago Switzerland is carefully evaluated for luminosity, structural integrity and transparent provenance.
Key Attributes
- Deep green tones with distinctive natural inclusions
- Historically one of the most prestigious coloured gemstones
- Ideal for bold bespoke creations and high-value collections
CONSULTATION
Expert Guidance & Bespoke Services
Selecting a precious gemstone is a decision rooted in expertise, provenance and long-term value. Our specialists are available for personalised guidance — whether you seek a bespoke creation or wish to expand your collection.
Schedule a private consultation and explore coloured gemstones with the same precision, transparency and craftsmanship that define Diago Switzerland’s diamond and gold expertise.
