M.T. Mohr
High-quality gemstones for professional jewelers and retailers from Idar-Oberstein since 1921.
Welcome to M.T. Mohr – Your gemstone store from Idar-Oberstein
Based in the gemstone town of Idar-Oberstein, the heart of the German gemstone industry, we can look back on over 100 years of company history. Our passion for gemstones and craftsmanship has been passed down from generation to generation, which is reflected in the quality of our products and services.
Our trade fair dates
05.-09. Sep. 2025 – Vicenzaoro
Jan. 16-20, 2026 – Vicenzaoro
Feb. 20-23, 2026 – Inhorgenta
Slider with continuous products from the store
Our product variety
In our gemstone store you will find an extensive range of:
- Faceted stones: Sparkling gemstones in various cuts and shapes.
- Cabochons: Gemstones with a smooth, polished surface for a special look.
- Pampels and balls: Ideal for unique pieces of jewelry and designs.
- Gemstone strands: Beautiful strands of gemstones, diamonds and sapphires.
- Custom-made products: Individual shapes, cuts and engravings according to your wishes.
360° view of selected stones
Experience high-quality gemstones in person
You can only really judge quality if you can see and touch it. That’s why we cordially invite you to examine our high-quality gemstones in person.
Visit to our grinding shop
Come to Rötsweiler near Idar-Oberstein and experience our grinding shop up close. See our master craftsmen at work and examine our complete range of products.
We come to you
We will be happy to visit you in your store or studio on request. Bring us your wishes – we will show you suitable stones from our extensive range.
Our services
- Custom-made products: Our in-house gemstone cutting shop enables us to realize special cuts and shapes entirely according to your ideas.
- Engraving work: Personalize your gemstone with an individual engraving.
- Setting work: Professional setting of your gemstones for all types of jewelry.
- Stringing work: Designing gemstone and pearl necklaces according to your wishes.
Image Service
Our gemstone cutters
Grinding shop in Rötsweiler near Idar-Oberstein
- Tradition and craftsmanship: Since its foundation by Karl August Mohr in 1921, our grinding shop has stood for the highest precision and quality.
- Express work: Fast implementation of your orders directly on site.
- Individual customer requests: implementation of special designs and cuts according to your ideas.
- Expert team: Our sanders have many years of experience and a trained eye for detail.
Partnership with a grinding shop in Sri Lanka
- Long-standing cooperation: We have maintained a trusting partnership with a gemstone cutting company in Sri Lanka for almost 60 years.
- High quality standards: Our preforms (pre-cut gemstones) are finished according to our technical standards.
- Diverse range: Thanks to this collaboration, we can offer you over 100 different types of gemstones.
- Fair trade: We attach great importance to fair working conditions and a trust-based relationship with our partners.
Our commitment to Fairtrade & environmental protection
- Fair working conditions: We guarantee our employees in Sri Lanka fair wages and safe working conditions in order to counteract local poverty.
- Social commitment: Support for the SOS Children’s Village Anuradhapura through financial sponsorships and the promotion of medical care and leisure activities.
- Sponsorship: Personal sponsorship for a 7-year-old boy to give him a better future.
- Environmental awareness: Neutralizing our CO₂ emissions by financing CO₂ reduction measures and actively contributing to environmental protection.
Follow us on Instagram: mtmohr_gems
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