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Lab-grown and natural diamonds · Sirius jewellery · handcrafted in the Czech RepublicA diamond and a piece of jewellery chosen with an expert at your side
IGI- and GIA-certified diamonds at guaranteed best prices, and handcrafted jewellery you design exactly to your own taste.
Certified diamonds with a best price guarantee
Select the cut, size and clarity in a clear, easy-to-read table. Buy the stone loose, or let us set it in a piece of jewellery.
From selection to finished piece in four steps
- 1Choose
A diamond from our range or a piece from the Sirius collection. We are happy to advise by WhatsApp or telephone.
- 2Design
Select the metal, size, centre stone, side diamonds and engraving right on the product page.
- 3We craft it
By hand in the Czech Republic, usually within 2–4 weeks. We send you photographs of the finished piece before dispatch.
- 4We deliver
Insured, gift-boxed, with the certificate. 30-day returns and lifetime servicing.
My name is Michal Auředník
I have worked with diamonds and jewellery since 2012. I will help you choose the ideal stone and create a piece exactly as you imagine it – with no pressure to buy, and at fair prices thanks to working directly with the producers.
- ✓ ULTIMATE-GEMS, a Czech company established in 2012
- ✓ IGI- and GIA-certified diamonds, every stone personally selected
- ✓ Instant support on WhatsApp
A certificate with every diamond and a best price guarantee
Our lab-grown diamonds come with an IGI certificate, our natural diamonds with a GIA certificate. You can verify the stone online at any time using the laser inscription on its girdle. We buy directly from cutting houses and producers with no middlemen – which is why we guarantee the best price on the market.
What our customers say
Trung Kien DuongI was very satisfied with Mr Auředník, above all thanks to his professional and helpful approach. Communication was quick and trouble-free throughout, and he always willingly answered all my questions. He also explained the whole process clearly and gave me useful recommendations. I had a fairly specific idea of what the ring should look like. Thanks to Mr Auředník's helpfulness and experience, that idea was brought to life. In my view the work is truly very precise and the result exceeded my expectations. I am completely satisfied both with the finished ring and with the whole approach and communication. Definitely recommended.
TomI was completely satisfied with Mr Auředník. I was looking for a quality platinum bracelet made exactly to my wishes, and thanks to his experience, helpfulness and professional approach everything went absolutely smoothly. Mr Auředník arranged for a bespoke platinum bracelet to be made for me at cost price, which I consider an exceptionally fair offer. He communicated openly throughout, patiently explained everything and advised on every detail. The final workmanship exceeded my expectations — the bracelet is precisely made, looks luxurious and the quality is truly top-class. If you are looking for someone reliable, honest and professional to make a bespoke piece of jewellery, I can recommend Mr Auředník with complete conviction.
Maraff007I can definitely recommend choosing and having rings made by laboratornidiamanty.cz. Mr Auředník guided me through the whole selection, helped answer my questions and gave very good advice. Communication was excellent. The ring looks very pretty, as does the nice box that came with it. The price was very good too. Definitely recommended.
Роман КимеринI bought lab-grown diamond here and everything was excellent. They were very understanding of my situation and handled everything quickly. Highly recommend!
MrKecelohVery good prices and plenty of variety in shape, colour and quality. I bought a 1.5 ct at a good price and also had a bespoke ring made, and it turned out great.
Tomáš AdámekA great experience with Mr Auředník for the second time now. The jewellery is of high-quality workmanship. Thanks!
Michaela ČečetkováGreat communication and on-time delivery. The stone arrived in beautiful packaging, I will definitely buy again, recommended! 😊
WardelloneThank you Michal for the amazing service, the ring is absolutely beautiful. It was a pleasure to meet you and I wish you the best.
Sarah PolanskaA few years ago I had a bespoke ring made by another company. Then, after a thorough search, I decided to replace the main stone and came across this website, where the prices were unbeatable compared with any competitor. I sent an enquiry by e-mail and the very next day, thanks to Mr Auředník's incredible helpfulness, I went to see the stone with no obligation. He even accommodated me with a time outside his normal working hours, which as a client I always appreciate enormously. The original plan was just to buy the stone, but Mr Auředník himself offered me the option of having the stones swapped under their care, as well as making sure the ring looked like new again. You will not find a company on the market with better prices or with such a customer-focused approach. Everything went smoothly, pleasantly and ultra fast. If I could give 100 stars, I would give them without hesitation.
AnastasiiaI am very happy with Michael's service, we've ordered two rings: one — my partner ordered an engagement ring, and then I've ordered wedding ring. Both of them look absolutely perfect, I keep receiving compliments from people! Apart from that, Michael speaks perfect English, that helped a lot to my English speaking husband, and Michael is very responsive, attentive to his clients and listens to all your wishes. I was tight on the deadline with my wedding ring, and Michael did his best to make it even earlier!
Marija DimmerovaI ordered diamond earrings and was completely satisfied with the whole purchase. The earrings are gorgeous, well made and match the description exactly. I would also very much like to highlight the excellent conduct of Mr Auředník, who was very helpful, professional and accommodating throughout. He patiently explained everything to me and helped me choose. I can only recommend buying here and I will certainly be happy to come back.
Aneta ŽižkováI really appreciate the quick communication. The diamond is gorgeous, exactly as I imagined and comes with a certificate. Definitely recommended!
Miloslava DrábkováI would like to thank Mr Auředník for his approach, quick communication and, last but not least, for his help with choosing. The earrings are gorgeous and met my expectations exactly. If I am ever looking for perfect and beautiful jewellery again, it will only be here. Thank you very much.
Kateřina FoitováIf I could give more stars, I would give them all 😊 An engagement ring is not something an ordinary person has made every day, so we went into it without any previous experience. Thanks to this company, though, that was no obstacle at all. Mr Auředník willingly and patiently answered all our nosy questions, gave great advice on choosing the materials and understood our very specific idea of what the ring should look like. The result is a piece of jewellery we are thrilled with — the goldsmith who made it literally has golden hands. Thank you very much, and we are delighted to recommend them!
Martina VernerováWhen I started the process of choosing a supplier of lab-grown diamonds, I approached 3–4 companies. It was Mr Auředník who won this selection process, not only with his approach and quick answers to my countless questions, but also with his patience and knowledge. Today he handed over the bespoke ring to me in person and I have to say it exceeded my expectations. IT IS GORGEOUS! I warmly and without hesitation recommend this company and wish it many more satisfied customers.
Pavel BorekI was very satisfied with my purchase at this shop. I appreciate their professional approach, helpfulness and genuine effort to help. I needed the product within a week and, even though it was a short deadline, they managed everything without any problems. It was clear that they really care about the customer. I will gladly come back here in the future and can truly only recommend this shop.
Aneta SpackovaWe would like to say a big thank you for making these gorgeous, high-quality bespoke wedding rings. Great, quick communication and above all a perfect professional approach, highly recommended 😊
Nada RapantovaI was completely satisfied. Mr Auředník communicated with me proactively and tried to accommodate all my requests as much as possible. The stones I bought and the finished earrings are gorgeous. A reliable company in every respect. I will definitely come back sometime in the future to choose something else.
Pavel BartošI was very satisfied with the purchase of my engagement ring. The owner was very helpful, meticulous and communicative, and throughout the whole process it was obvious that customer satisfaction comes first for him. Thank you!
Zuzana ŠevcováI warmly recommend this shop. I ordered a small lab-grown diamond, 3 mm in diameter, for a ring. The parcel arrived on the third day after ordering. I have to praise the meticulous packaging. The diamond is gorgeous 🙂
FoxiI bought my wife a platinum ring here with a lab-grown diamond of great quality. The result is an attractively priced yet very luxurious platinum ring with a one-carat diamond, perfectly thought out and crafted down to the last detail! On top of that, Mr Auředník's friendliness, helpfulness and conduct are equally excellent. I will definitely buy here again!
Marie MatějkováI can only recommend! Pleasant manner, helpfulness, professionalism, nothing is a problem. Even though I had high demands, every single one of my wishes was fulfilled :)
Viktor VýbošťokAs a satisfied customer I can only warmly recommend them to everyone. A professional approach from the owner from the very beginning right through to the delivery of the diamonds. Above all I appreciate the quick communication and the unbeatable price on the Czech and Slovak market. If you want quality at an excellent price, you are in the right place.
Karel DresdenWe bought diamonds here and also had them made into jewellery by the same company. A great result! 👍
Jiří DoleželGreat communication and quality of workmanship.
Stano ValkoAn above-standard approach, helpfulness and everything that goes with it. Thank you.
H. SMExcellent service!
Would you like to know more?
Not sure which to choose?
Write to us or give us a call – together we will select the ideal diamond or design a piece exactly as you imagine it. Free of charge and with no obligation.
WhatsApp +420 777 222 121 info@laboratornidiamanty.cz Contact and enquiries