Buy polished diamonds from South Africa's trusted diamond dealer.

Buy Diamonds with confidence.

We are the leading supplier to the SA market.

Over 25 years, Diagem Diamonds has built a strong reputation for selling high-quality diamond rings and we’re also proud to have one of the largest collections of loose diamonds available to purchase online or from our physical office in Rosebank. Buying a loose certified diamond from South Africa's trusted diamond dealer has never been easier enter our online store or make an appointment to come and see us, we will leave no stone unturned to find the diamond of your dreams.

Certified loose diamonds

After being cut and polished at our factory, all high quality loose diamonds are subject to a certification process by a gemological laboratory, such as the GIA, or EGL. The laboratory evaluates each stone basic quality characteristics, including shape, color, clarity, carat weight, cut. When you purchase a loose diamond that has gone through the diamond certification process, you can be confident in the quality of your stone. Additionally stones that have been certified can be easily identified and retain more value than their uncertified counterparts. Please explore our diamond tutorial below.

Buy certified diamonds
Diamond engagement ring

Polished in SA

Our rough diamonds are sourced from South African mines and polished in our diamond polishing factory to highest international standards.

diamond is forever

We are perfectionists  

Our customers love our Diamonds and we love them :)

Diamond polishing

State of the art diamond polishing.

Each diamond is truly unique and one of a kind.

Buy Diamonds from SA leading wholesale diamond dealer

Design your bespoke jewellery.

Design your diamond jewellery

We are diamond cutters however should you require we will help you design and create any piece of diamond jewellery, to match your exact specifications. The best part We do it at a fraction of the price.

You are buying Diamonds and diamond jewellery direct at factory prices.

Know who you are trading with.

Diamond dealer club of SA

We have been diamond dealers in the South African market for more then 25 years. We are members of The Diamond Dealers Club of SA, as well as the World Federation of Diamond Bourses, thus giving you the peace of mind to buy diamonds with confidence.

Diagem sells conflict free diamonds

When you purchase at Diagem Diamonds you can be confident that your diamond has been mined and processed in an environmentally and socially conscious manner. Additionally, we support initiatives such as the Kimberley Process, against the illicit acquirement and distribution of diamonds. We support all programs that encourage the development and regulation of the diamond trade, which continues to serve as a valuable source of employment and revenue for countries throughout the world.