Choose the diamond. Create the piece.
Certified loose diamonds for bespoke jewellery and private selection: lab-grown diamonds certified by IGI and natural diamonds certified by GIA.
IGI-certified lab-grown diamonds
Lab-grown diamonds certified by IGI, available loose or set into a bespoke piece. Most of our current ready-to-wear pieces use VVS lab-grown diamonds.
GIA-certified natural diamonds
Natural diamonds certified by GIA, available loose or set into a bespoke piece. Our princess cut engagement ring is set with natural diamonds.
Choose the stone first, then build the piece around it.
Message us with the shape, size or budget you have in mind and we’ll arrange an appointment to view options. Diamond availability and prices [TBC by J].
Visit NTB Jewellers by private appointment in Knightsbridge.
Whether you are designing a bespoke piece, choosing a certified diamond, viewing stock jewellery or enquiring about a sourced watch, start with a WhatsApp message and we’ll guide you from there.
Mon–Fri 11am–6pm · 21 Knightsbridge, Second Floor, Office 16, SW1X 7LY