DIA is a grading laboratory specializing in Diamonds, Tanzanite and Jewellery Evaluations.
The company was established in 1996 by GIA qualified grader Lesley Tsakos, and has continued to grow and service the industry for the past 21 years. Now owned by daughter Nichola van Niekerk and long standing colleague Nicolette van Niekerk, the company is continuing to grow on the strong foundation on which it was built. In 2017 the company expanded its services to include Tanzanite grading as well as Jewellery Valuations.
DIA grades to International Standards, which includes calling the “SI3” grade, and keeps up to date with the latest equipment that assists us in our process, the most recent being the GIA DIAMONDCHECK™. The GIA DIAMONDCHECK™ examines colourless stones in the D – N range. It identifies untreated natural diamonds and refers other for further analysis. Each diamond is graded individually and is issued with a certificate of authentication. In 2014 we also introduced our “Online Verification” process, this is a great tool for being able to be anywhere in the world and to confirm a stones authenticity just by logging onto our website. DIA’s certificate is well respected in the industry.
DIA certificates are trusted by diamond manufacturers, jewellery retailers, and consumers alike for our accuracy and consistency in every aspect of diamond and tanzanite grading. At the DIA we are professional yet very approachable and are always happy to provide expert advice on repairs, improvements and re-cutting so that we provide our client with the very best grade possible. These services are why DIA has become one of South Africa's trusted and well respected laboratories in our industry.
As an independent company, not contracted to either retail jewellers or insurance companies, we can provide unbiased high-quality valuations for any purpose. We value all Diamond and Tanzanite jewellery. A jewellery valuation is an informed opinion based on the expertise of the valuer. A professional jewellery valuation certificate provides you with a full inventory of all your items. This establishes the value of the items in the event of a loss. Thus providing a sound foundation on which to base a claim to insurers.
The company was established in 1996 by GIA qualified grader Lesley Tsakos, and has continued to grow and service the industry for the past 21 years. Now owned by daughter Nichola van Niekerk and long standing colleague Nicolette van Niekerk, the company is continuing to grow on the strong foundation on which it was built. In 2017 the company expanded its services to include Tanzanite grading as well as Jewellery Valuations.
DIA grades to International Standards, which includes calling the “SI3” grade, and keeps up to date with the latest equipment that assists us in our process, the most recent being the GIA DIAMONDCHECK™. The GIA DIAMONDCHECK™ examines colourless stones in the D – N range. It identifies untreated natural diamonds and refers other for further analysis. Each diamond is graded individually and is issued with a certificate of authentication. In 2014 we also introduced our “Online Verification” process, this is a great tool for being able to be anywhere in the world and to confirm a stones authenticity just by logging onto our website. DIA’s certificate is well respected in the industry.
DIA certificates are trusted by diamond manufacturers, jewellery retailers, and consumers alike for our accuracy and consistency in every aspect of diamond and tanzanite grading. At the DIA we are professional yet very approachable and are always happy to provide expert advice on repairs, improvements and re-cutting so that we provide our client with the very best grade possible. These services are why DIA has become one of South Africa's trusted and well respected laboratories in our industry.
As an independent company, not contracted to either retail jewellers or insurance companies, we can provide unbiased high-quality valuations for any purpose. We value all Diamond and Tanzanite jewellery. A jewellery valuation is an informed opinion based on the expertise of the valuer. A professional jewellery valuation certificate provides you with a full inventory of all your items. This establishes the value of the items in the event of a loss. Thus providing a sound foundation on which to base a claim to insurers.
