Frequently Asked Questions

Every piece is handcrafted to order, exactly to your configuration. Production usually takes 2–4 weeks. We send you photographs of the finished piece before dispatch.

For rings, earrings and pendants with a centre stone, the price shown is for the mount without the stone. You choose the diamond from our range (lab-grown or natural) right on the product page and its price is added. For earrings you select a matching pair of stones.

Physically and optically, none – a lab-grown diamond is chemically identical carbon with the same hardness, brilliance and certification. It differs in where it was formed and in its price. You will find a detailed comparison on our Natural vs Lab-Grown Diamonds page.

Yes. Lab-grown diamonds come with an IGI certificate, natural diamonds with a GIA certificate. The certificate number is laser-inscribed on the girdle of the stone and can be verified online at any time.

Stones in stock are specific stones with their own certificate, dispatched within 1–2 working days. Stones to order are produced according to our price list – we confirm the delivery time once you have ordered (natural diamonds usually within 14 working days).

Measure the inside diameter of a ring that fits you well, or the circumference of your finger with a length of thread, and compare it with the size chart shown where you select the size. We are happy to advise on WhatsApp. The ring can be resized free of charge after delivery.

Yes. On request we will alter the size or cut of the diamonds, the width and profile of the band, the metal and other details. We also make jewellery entirely to your own design or photograph – see Bespoke Jewellery.

Yes. You enter the engraving text when you place your order; we confirm the font, position and length with you before production.

Within the Czech Republic GLS delivers for CZK 149, to Slovakia a courier for CZK 299, to the rest of Europe GLS for €30 and overseas for €60. Every parcel is insured and your jewellery arrives in elegant gift packaging. Outside the European Union we supply without Czech VAT; any import duty and tax in the destination country is paid by the recipient.

Sirius jewellery is made to order to your specification, so under Section 1837 of the Czech Civil Code it cannot be returned or exchanged. Stones in stock are covered by the statutory 14-day period. Every piece also comes with free lifetime servicing, and we adjust the ring size free of charge after delivery.

By card online, by bank transfer or in instalments – details can be found on the Jewellery on Instalments page and in our terms and conditions.

The quickest way is WhatsApp on +420 777 222 121 or e-mail at info@laboratornidiamanty.cz. We will gladly arrange a personal appointment individually.