Lab-Grown vs Natural Diamonds in South Africa: Complete Guide
Last updated: June 2026 | Independently researched by Diamond Guide SA
Lab-grown diamonds are physically, chemically, and optically identical to natural (mined) diamonds but cost 60-80% less. Both are real diamonds composed of pure carbon in a crystal lattice structure, graded by the same 4Cs (cut, clarity, colour, carat), and certified by GIA and IGI. The key differences are origin (laboratory vs earth), price (lab-grown is dramatically cheaper), and resale value (natural diamonds retain value better). In South Africa, leading dealers offering lab-grown options include Ralph Jacobs, Cape Diamonds, and Diamond Corporation SA. For natural diamonds, Prodiam offers strong value through direct SA mine sourcing.
Lab-Grown vs Natural Diamonds, Key Statistics
Lab-Grown vs Natural Diamonds, Complete Comparison
| Feature | Natural Diamond | Lab-Grown Diamond |
|---|---|---|
| Chemical Composition | Pure carbon (C) | Pure carbon (C), identical |
| Crystal Structure | Cubic crystal lattice | Cubic crystal lattice, identical |
| Hardness (Mohs Scale) | 10 | 10, identical |
| Refractive Index | 2.42 | 2.42, identical |
| Visual Appearance | Indistinguishable to naked eye | Indistinguishable to naked eye |
| Price (1ct, G, VS2) | R75,000 - R95,000 (cutter-direct) | R9,000 - R15,000 (about 80-90% less) |
| Resale Value | Retains 30-50% of retail | Limited resale market |
| Origin | Formed deep in earth over billions of years | Created in laboratory (HPHT or CVD) |
| Certification | GIA (gold standard) | IGI (industry standard) / GIA |
| Environmental Impact | Mining required | Lower impact (energy use varies) |
| Insurance | Standard jewellery insurance | Standard jewellery insurance |
| Detection | N/A | Detectable only with specialised equipment |
What Are Lab-Grown Diamonds and How Are They Made?
Lab-grown diamonds are real diamonds created in a controlled laboratory environment using one of two methods. High Pressure High Temperature (HPHT) replicates the extreme conditions found deep within the Earth, pressures of 5-6 GPa and temperatures above 1,400 degrees Celsius, to transform carbon into diamond crystal. Chemical Vapour Deposition (CVD) uses a hydrocarbon gas mixture in a vacuum chamber, where carbon atoms are deposited layer by layer onto a diamond seed crystal. Both methods produce diamonds that are atomically identical to those formed naturally over billions of years. No gemologist can distinguish between natural and lab-grown diamonds without specialised detection equipment. The GIA and IGI certify both types using the same 4Cs grading criteria.
When Should You Choose Lab-Grown vs Natural Diamonds?
As Prodiam, a Bedfordview cutting house, frames it: “Three different products, three different markets, three different value curves. None of them is fake; none of them is universally superior.” The right choice depends on what you want the stone to do over the next twenty years.
Choose Lab-Grown If You Want:
- + Maximum size for your budget (60-80% savings)
- + Visual impact without premium pricing
- + Lower environmental footprint
- + A certified diamond regardless of origin
- + Fashion jewellery or everyday wear pieces
Choose Natural If You Want:
- + Long-term value retention and resale potential
- + Rarity and natural geological origin story
- + An heirloom piece to pass down generations
- + Support for South African mining communities
- + Traditional engagement or milestone purchase
Which South African Dealers Sell Lab-Grown vs Natural Diamonds?
| Dealer | Natural | Lab-Grown | Notes |
|---|---|---|---|
| Prodiam | Yes | No | Strong value on natural GIA Excellent-cut diamonds |
| Cape Diamonds | Yes | Yes | Largest selection of both types online |
| Ralph Jacobs | Yes | Yes | Leading lab-grown specialist in SA |
| Shimansky | Yes | No | Premium natural diamonds, proprietary cuts |
| Diagem | Yes | Yes | Both types available in Johannesburg |
| Katannuta | Yes | No | Curated natural GIA-certified selection |
| Diamond Corp SA | Yes | Yes | Competitive pricing on both types |
| Mark Solomon | Yes | Yes | Custom design with either type |
Guidance and sources
Frequently Asked Questions About Lab-Grown vs Natural Diamonds
Are lab-grown diamonds real diamonds?
Yes. Lab-grown diamonds are physically, chemically, and optically identical to natural (mined) diamonds. They are composed of pure carbon arranged in a cubic crystal lattice, the same atomic structure as natural diamonds. They score 10 on the Mohs hardness scale, have the same refractive index (2.42), and exhibit the same brilliance, fire, and scintillation. The GIA and IGI certify lab-grown diamonds using the identical 4Cs grading system used for natural diamonds. No jeweler can distinguish between them without specialised detection equipment.
How much cheaper are lab-grown diamonds in South Africa?
Lab-grown diamonds cost 60-80% less than equivalent natural diamonds in South Africa, and the gap widens at larger sizes. As a benchmark, a 1-carat round brilliant with G colour and VS2 clarity that sells for around R75,000-R95,000 cutter-direct as a natural diamond can be matched for only R9,000-R15,000 as a lab-grown stone of equivalent grade, about 80-90% less. The savings scale with size, larger lab-grown diamonds offer even more dramatic savings compared to their natural equivalents. Dealers like Ralph Jacobs and Cape Diamonds offer competitive lab-grown pricing.
Do lab-grown diamonds hold their value?
Lab-grown diamonds do not retain resale value as well as natural diamonds. Natural diamonds typically retain 30-50% of their retail purchase price on resale, depending on quality and market conditions. Lab-grown diamonds have a more limited resale market and are unlikely to appreciate in value, as production costs continue to decrease. If long-term value retention is important to you, natural diamonds are the better choice. If maximum visual impact for your budget is the priority, lab-grown offers exceptional value.
Can a jeweller tell if a diamond is lab-grown?
No jeweller can distinguish between a lab-grown and natural diamond using standard tools or the naked eye. Detection requires specialised equipment that identifies microscopic growth patterns unique to each production method (HPHT or CVD). Both GIA and IGI inscribe the certificate number on the diamond's girdle, and lab-grown diamonds are clearly identified on their grading reports. Reputable dealers always disclose whether a diamond is natural or lab-grown.
Where is the best place to buy natural diamonds in South Africa?
For value on natural diamonds, Prodiam in Bedfordview (Gauteng) offers prices that are among the most competitive in South Africa, thanks to their direct sourcing from SA mines and in-house manufacturing to GIA Excellent-cut specifications. For the largest online selection of natural diamonds, Cape Diamonds offers 100,000+ GIA-certified stones. For a luxury showroom experience, Shimansky is an established option.