Dealer-Direct Certified Diamonds and Bespoke Jewellery
From the mine to your finger.
Call David: Call David
What are you looking for?
Explore our collections — click to dive deeper
Bespoke Jewellery
Custom-designed and handcrafted to your exact vision
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Natural Diamonds
GIA & IGI certified loose diamonds at factory-direct prices
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Lab-Grown Diamonds
Ethically created, CVD & HPHT certified — same beauty, better value
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Ring Styles
Solitaire, halo, three-stone and bespoke engagement rings
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Diamond Earrings
Stunning certified diamond earrings for every occasion
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Diamond Shapes
Round, princess, oval, cushion and more — find your shape
→Why Diagem?
Real Person, Not a Robot
Call David. A real diamond expert answers. No chatbots, no automated responses, no call centres — ever.
From the Mine to the Finger
We cut and polish our own diamonds. From the mine to the finger — no middlemen. That means real factory-direct pricing.
Beat Any Quote
Send us a competitor's quote with certificate details. We'll beat it on any like-for-like certified diamond.
Industry Credentials
Diagem is a verified member of the DDCSA and WFDB — bodies that regulate local and international diamond dealers. Only established, ethical dealers are admitted.
Diamond Dealers Club of South Africa
Full member of the DDCSA — South Africa's leading body regulating diamond dealers. Membership requires proven ethical standing.
Verify our credentials →World Federation of Diamond Bourses
Member of the WFDB — the global authority representing diamond bourses and dealers in over 30 countries worldwide.
Learn more →GIA & IGI Certified
Every diamond we supply is independently graded by the GIA or IGI — the world's most trusted gemological laboratories.
View certified diamonds →We don't just say we're trustworthy — we're certified by the organisations that define what trust means in the diamond industry.