Diamonds & Gemstones
Diamonds & gemstones
Every stone, chosen by a goldsmith
From certified natural diamonds to lab-grown diamonds and rare coloured gemstones, Martin Nagel hand-selects every stone we set. Choose one from us, or bring your own, and we'll design and make your engagement ring, wedding band or fine jewellery around it in our Sandton studio.
01 · Natural diamonds
Mined diamonds & the 4Cs
Natural diamonds, formed deep in the earth over billions of years. We source GIA, IGI and EGL certified stones and help you balance cut, colour, clarity and carat for your budget.
- Certified round and fancy shapes
- Engagement-ring centre stones and smalls
- Honest advice on the 4Cs
02 · Lab-grown diamonds
Real diamonds, created above ground
The same sparkle, hardness and beauty as a mined diamond, often at a significantly lower price for the same size and quality.
- Certified lab-grown diamonds (IGI)
- Larger stones for your budget
- Natural or lab-grown: we'll help you choose
03 · Coloured gemstones
Gemstones for sale
Sapphires, aquamarines, tourmalines and more: natural loose gemstones, hand-selected for colour, cut and character, with honest descriptions of origin and treatment.
- One-of-a-kind loose stones, ready to set
- Set in a bespoke ring, pendant or earrings
- Can't see what you want? We'll find it
04 · Birthstones
A gemstone for every month
Birthstone jewellery makes a meaningful gift for birthdays, anniversaries and new arrivals. Find each month's stone, its colours and its meaning.
- All twelve months explained
- Rings, pendants and earrings made to order
- Family and mother's rings
Your stone
Bring your own stone
Have a family diamond or gemstone? We'll check it, advise you and reset it into a new design.
Any stone
Sourced to order
Looking for a specific size, colour or shape? We source from trusted suppliers all over the world.
Our workshop
Made in Sandton
Every piece is designed and handcrafted in our own workshop, by goldsmiths with three decades of experience.
See them in person
Schedule a viewing
Martin will show you a selection of diamonds and gemstones to suit your design and budget, in our Illovo studio.
Schedule a viewing consultationStart your story