About Us
Based in the Czech Republic, we have been passionate about gemstones and fine jewellery since 2012.
Our Story
My name is Michal Aurednik, and I'll be your personal contact for all your lab-grown diamond needs. Based in the Czech Republic, I have been passionate about gemstones and fine jewellery since 2012, when I founded ULTIMATE-GEMS. Over the years, we became one of the world's leading sellers of quality gems, earning excellent customer reviews.
When we embraced the exciting rise of lab-grown diamonds — an ethical, sustainable, and affordable alternative to mined diamonds — we now specialize in premium lab-grown diamonds and natural diamonds, offering the best value and quality in the market. Our exclusive Sirius jewellery collection showcases stunning designs featuring certified lab-grown diamonds crafted to meet global demand.
To make the world's most beautiful diamonds accessible, ethical, and sustainable — without ever compromising on brilliance.
Our Values
Ethical Commitment
From origin to setting, every diamond in our collection is traceable and responsibly created. We believe luxury and integrity must go hand in hand.
Uncompromising Quality
Each stone is hand-selected by our gemologists and set by master artisans. We accept nothing less than perfection in every facet.
Exceptional Service
From your first inquiry to the moment your piece arrives, our dedicated consultants provide a seamless, personalised experience.
Our Craftsmanship
Our jewellery is crafted by a master goldsmith with over 20 years of experience and shaped by a designer with more than a decade of expertise.
We do not offer hundreds of designs. Instead, we present a carefully curated collection, refined for maximum beauty and timeless elegance. Together with you, we create something truly unique.
Lab-Grown Diamonds
- Environmentally Conscious — Our laboratory-grown diamonds require significantly fewer natural resources to produce. By choosing lab-grown, you embrace luxury that honours the planet for generations to come.
- 100% Conflict-Free — Every Laboratory Diamonds gemstone is created in a controlled environment, entirely free from the ethical concerns associated with traditional diamond mining. Choose brilliance with a clear conscience.
- Exceptional Value — Laboratory-grown diamonds offer exceptional value, allowing you to select a larger, higher-quality stone at a fraction of the cost of a mined equivalent — without sacrificing a single facet of beauty.
- Unmatched Quality — Chemically, physically, and optically identical to mined diamonds, our stones are certified by the world's leading gemological institutes. Uncompromising quality is our hallmark.
Begin Your Journey
Whether you are searching for the perfect engagement ring or a bespoke piece of fine jewellery, our team of experts is here to guide you every step of the way.