CG Diamonds represents one of the largest diamond cutting factories in South Africa, specializing in GIA certified diamonds, from 0.30 ct. to 10.00 ct.



CG Diamonds South Africa has partnered with one of South Africa’s leading jewellery designers Olga Jewellery Design Studio. Olga, established in 1976, has designed and manufactured handmade pieces for clients all over the world. Select your engagement ring from over 500 personalised designs. All handcrafted to perfection!

We are very privileged to become part of their team and make bespoke pieces. By choosing your diamond from CG Diamonds South Africa and selecting your Olga inspired design, you will be assured of the finest quality and best value.

What Makes CG Diamonds A Cut Above The Rest

  • Save up to 40% off retail pricing by purchasing your diamond from CG Diamonds South Africa.
  • Colin Goodman (MD of CG Diamonds South Africa) is married to Olga Goodman (one of South Africa’s leading jewellery designers). Olga is the owner of Olga Jewellery Design Studio who will personally be involved in the design and manufacturing of your bespoke piece.
  • Before purchasing a diamond online, protect your purchase by ensuring that the diamond is certified by the most reputable and recognized diamond laboratory in the world (GIA) that protects you for life. Every diamond that is certified by the GIA has inscribed a number on the diamond itself that matches your certificate thereby making it impossible for your diamond to be swapped. All our diamonds are GIA certified.
  • Don’t purchase a diamond that’s graded (Cut / Polish / Symmetry) below excellent / very good. CG Diamond’s only sells diamonds that are graded excellent / very good. 
  • Once you have approved your choice of diamond/ ring, you pay a 10% deposit. We then Courier your diamond/ring direct to you (fully insured). Payment can be negotiated, terms are offered to suit your financial situation. Once you receive your order and you’re 100% happy, you pay the balance. If you are not satisfied we guarantee you a FULL REFUND.
  • We will better any written quote.
  • We ship all over the world.
  • Every diamond purchased from CG Diamonds can be upgraded at any given time. CG Diamonds will sell your diamond ring on your behalf for 15% commission. You can upgrade your diamond with the money realized form the sale.
  • CG Diamonds South Africa’s factory represents one of the largest diamond cutting factories in South Africa. At any given time, we carry in excess of 1000 diamonds in stock.

  • CG Diamonds polishes highest quality diamonds (in all colours) ranging from 0.30cts. to 10.00 cts.

  • You can choose between purchasing a loose diamond (at 40% below retail price) or selecting a custom made ring of your choice, personally designed and manufactured by Olga and her design team.

  • Every diamond / ring purchased from CG Diamonds is photographed and comes with a retail valuation and GIA certificate.


Knowing relevant information about a product allows you to avoid overpaying for poor quality goods and diamonds are no exception. Watch the video below to begin educating yourself.


CG Diamonds are fully accredited by GIA and certified by EGL, two of the most reputable diamond-grading bodies in the world.

CG Diamonds are partnered up with the biggest diamond cutter in the world.

CG Diamonds guarantees a risk-free 14-day return policy and the peace of mind from safely holding a customer’s money until they are 100% satisfied with their purchase.

Unlike other suppliers, CG Diamonds South Africa offers highly competitive prices over a range sizes and provides diamond education to customers.

Client Testimonials

 “Thank you all, absolute legends!

Colin, thank you so much for sorting me out with tip top advice, and some additional much-needed guidance.  Thank you for sourcing the perfect rock!”

Paddy 2019

“Dear Sirs,

I’d like to express my thanks for your professional assistance when I bought a 1,00ct diamond for my wife.  You advised me on how to save money by going for a particular colour and clarity, while not compromising on the size of the stone.  My wife and I are very satisfied with our purchase.”

Lesley, Durban 2019

“In February of this year my fiancée and I bought a top quality diamond through your website.  We found the layout easy to follow and the response from you and your staff to be prompt and courteous. We are also thrilled with the lovely ring, designed by your wife, Olga.  I would recommend you to anyone.”

Ray, Cape Town 2019

“I made the decision to propose to my girlfriend, but then I realised that it wouldn’t be that simple – a ring was needed! There are so many jewellers in the phone book, what was I to do? So I googled (as one does!) and came across CG Diamonds’ website.  It was a leap of faith on my part, as I knew nothing about diamonds. . . so I placed myself in Colin’s hands, and am happy to say that it was the best decision I could have made.  My girlfriend is now my future wife and is proud of her beautiful diamond ring designed by Olga.”

Christian M, U. K. 2019

 “Baie dankie aan Colin en sy span by CG Diamonds. Hulle het ons so mooi bygestaan in die moeilike proses om die perfekte Diamant te kies. Hulle pryse is ongelooflik en die handewerk is uistekend!”

Andre Poolsen , Kaapstad 2019

 “I can recommend CG Diamonds to anyone looking to buy a good quality diamond.  They are very helpful and always go the extra mile to ensure customer satisfaction.  Although their diamond business is web based, one can pop in at any time to meet Colin and Olga in their Waterfront store.”

Rosh, Durban 2019

 “Beste pryse in die land. Ek en my verloofde wil net dankie se vir die uitstekende diens en sal hulle enige tyd aanbeveel. Colin het met ons sy kennis gedeel en saam  met sy vrou , Olga,het ons die perfekte ring ontwerp vir ons spesiale dag. CG Diamonds is eerste in sy klas”

Gerhard Eksteen , Stellenbosch 2019

“Just to provide you with some feedback after our recent purchase of an oval diamond from you – we appreciated the personal touch and all the trouble you took, sourcing the perfect stone from your factory in record time. We were made to feel completely safe and comfortable buying over the web, and my wife is the proud owner of a lovely ring, set with an E colour diamond, the envy of all her friends!”

Isak, Cape Town 2019

 “Dankie, dankie, dankie CG Diamonds! Ek het my droom ring gekry. Ek het lank gesoek na die regte plek en die regte prys. Die personeel was baie professioneel en het ons baie geleer van Diamante. Ek sal almal aanbeveel om hulle n kans te gee”

Yvonne Maree, Camps Bay 2019

 “Colin and Olga Goodman are the perfect team.  Colin gave me the confidence to buy a diamond and Olga designed a lovely ring – exactly what we wanted!  They are very professional but still managed to make me feel comfortable while making such an important purchase. Thanks to both of you.”

Daniel G, Johannesburg 2019

 “Colin Goodman was a great help to me and my fiancée when we purchased a diamond from CG Diamonds earlier this year.  He explained the importance of the diamond Certificate and walked us through the intricacies of diamond grading.  He helped us choose a diamond that was within our budget,  but was still excellent value for money.  We chose a design for the ring which was hand made by Olga’s team of master goldsmiths to the highest standards, making my fiancee’s dream of the perfect engagement ring come true.”

Scott F Cape Town 2019