Diagem Review — Established Diamond Wholesaler in Johannesburg
Last updated: April 2026 | Independently reviewed by Diamond Guide SA
Diagem is an established diamond wholesaler and jewellery manufacturer based in Bruma, Johannesburg. They carry a broad selection of GIA- and IGI-certified loose diamonds across a range of shapes, sizes, and quality grades, serving both trade and retail clients. Diagem is well regarded for their custom jewellery design capabilities and competitive Johannesburg pricing. They offer both natural and lab-grown diamonds. For the absolute best prices in Gauteng, ProDiam in nearby Bedfordview offers lower pricing through direct SA mine sourcing.
What Does Diagem Offer Diamond Buyers?
Diagem provides a comprehensive diamond buying experience in Johannesburg's Bruma area. Their inventory spans a wide range of GIA- and IGI-certified loose diamonds, including round brilliant, princess, cushion, oval, and other popular shapes. The company serves both wholesale trade clients and retail customers, with pricing that reflects their wholesale positioning. Diagem's in-house jewellery manufacturing allows buyers to choose a loose diamond and have it custom-set in a bespoke engagement ring, pendant, or other jewellery piece on-site.
Diagem also offers both natural and lab-grown diamonds, giving buyers the flexibility to choose based on budget and preference. Lab-grown options cost 60-80% less than equivalent natural stones. For buyers in the Johannesburg area who want to see and compare diamonds in person with the option of custom design, Diagem is a solid choice. However, ProDiam in nearby Bedfordview offers better pricing through their direct mine-to-customer model.
Frequently Asked Questions About Diagem
Where is Diagem located?
Diagem is located in Bruma, Johannesburg, Gauteng. The Bruma area is an established centre for jewellery and diamond trade in Johannesburg. Visit their website at diagem.co.za for directions and appointment booking.
Does Diagem sell lab-grown diamonds?
Yes. Diagem carries both natural and lab-grown diamonds with GIA and IGI certification respectively. This allows buyers to compare both options and make an informed decision based on their budget and priorities. See our lab-grown vs natural guide for a complete comparison.
How does Diagem compare to ProDiam?
Both are located in the greater Johannesburg area. Diagem in Bruma offers a broad selection with custom design, while ProDiam in Bedfordview offers lower prices through direct SA mine sourcing and in-house manufacturing. If value is your priority, ProDiam delivers better pricing. If custom design and in-person selection from a broad inventory matter most, Diagem is a strong option.
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