What Is Moissanite? The Complete Guide for South African Buyers

Moissanite is a gemstone that was first discovered in 1893 inside a meteor crater in Arizona. The scientist who found it, Henri Moissan, initially thought he had found diamonds. He had not. What he had found was silicon carbide, a material so rare in nature that every moissanite sold today is created in a laboratory.

That origin story matters. Moissanite is not a diamond simulant in the way that cubic zirconia is. It is a distinct gemstone with its own properties, its own certification, and its own place in fine jewellery. It happens to look very similar to a diamond, but the two stones are chemically and structurally different.

South African buyers have taken to moissanite quickly. It offers exceptional brilliance, a hardness second only to diamond, and a price that is a fraction of what a comparable diamond would cost. For couples who want a beautiful, lasting stone without spending more than they need to, it makes a great deal of sense.

This guide covers everything you need to know about moissanite before you buy.

Where Moissanite Comes From

Natural moissanite is extraordinarily rare. The only significant deposit ever found came from that 1893 meteorite in Arizona, and it was too small to be used commercially. Every moissanite engagement ring you see today contains a lab-created stone.

That is not a compromise. Lab-created moissanite is chemically identical to the natural material. It is pure silicon carbide, grown under controlled conditions that produce a consistent, high-quality gemstone every time. The process was developed and refined over decades, and the technology is now mature enough to produce stones that are virtually flawless.

Because it is lab-created, moissanite carries no mining concerns. There is no displacement of communities, no environmental damage from open-pit extraction, and no murky supply chain. You know exactly where your stone came from.

How Moissanite Compares to Diamond

The two most common questions about moissanite are: does it look like a diamond, and how durable is it? Both have clear answers.

Appearance

Moissanite and diamond look very similar in everyday lighting. Both are colourless or near-colourless, both have exceptional clarity, and both catch the light well. The main visual difference is that moissanite has a higher refractive index than diamond, which means it reflects more light and produces more fire, the coloured flashes you see when a stone catches direct sunlight.

Some people love that extra fire. Others prefer the cooler, more restrained brilliance of a diamond. Neither is objectively better. It comes down to personal taste.

In normal conditions, including indoor lighting, office environments, and photographs, most people cannot tell the difference between a well-set moissanite and a diamond. The difference becomes more visible in bright direct sunlight, where moissanite's fire is noticeably more intense.

Hardness and Durability

Diamond sits at 10 on the Mohs hardness scale, the highest rating possible. Moissanite sits at 9.25, which makes it the second hardest gemstone used in jewellery. For context, sapphire and ruby sit at 9, and emerald sits at 7.5.

A Mohs rating of 9.25 means moissanite is extremely resistant to scratching. It will handle daily wear without difficulty, and it will hold up to decades of use without losing its surface polish. A moissanite engagement ring bought today will still look the same in 30 years.

Moissanite also does not chip or crack easily. It has good toughness, which is a separate property from hardness and refers to resistance to impact. You can wear it every day without worrying about it.

Colour

Earlier generations of moissanite had a slight yellow or grey tint under certain lighting conditions. That is largely no longer the case. Modern moissanite, including the stones we use at Moissanite Engagement Rings SA, is produced to a colourless or near-colourless standard. Under normal conditions it reads as white and bright.

If you want to compare stones directly, visit our moissanite engagement ring collection and our lab diamond engagement ring collection side by side. The difference in appearance is subtle.

Moissanite Pricing in South Africa

This is where moissanite makes the most obvious practical sense. A one-carat natural diamond of good quality will cost between R60,000 and R120,000 depending on the cut, clarity, and colour. A one-carat moissanite of equivalent visual quality costs around R12,995 at Moissanite Engagement Rings SA.

That is not because moissanite is inferior. It is because the supply of natural diamonds is controlled, and the price reflects that. Moissanite is produced in a laboratory, the supply is stable, and the price reflects the actual cost of production rather than artificial scarcity.

For a full breakdown of engagement ring costs in South Africa, including how metal choice and ring setting affect the total price, read our engagement ring cost guide.

Moissanite Certification

In South Africa, moissanite stones are certified by the Gemological Research Association, known as the GRA. A GRA certificate confirms the stone's identity, its measurements, its colour grade, and its clarity grade. It is the standard certification for moissanite in the South African market.

Every moissanite ring from Moissanite Engagement Rings SA comes with a GRA certificate. This gives you an independent, documented record of exactly what you have purchased.

If you are comparing moissanite to a lab-grown diamond, the certification body is different. Lab diamonds are typically certified by the IGI or the GIA. You can read more about how these certificates compare in our moissanite vs lab diamond guide.

Is Moissanite Right for an Engagement Ring?

Engagement rings need to last a lifetime. The stone has to hold up to daily wear, resist scratching, stay bright over decades, and look as good at the 25-year anniversary as it did on proposal day.

Moissanite meets all of those requirements. Its hardness of 9.25 means it resists scratching better than almost any other gemstone. Its brilliance does not diminish over time. It does not require special cleaning or maintenance beyond the normal care you would give any fine jewellery.

The only real question is whether you prefer the look of moissanite or diamond. They are close, but they are not identical. If you want to see both in person before deciding, get in touch and we can walk you through the options.

If you have a specific design in mind and want to build it from scratch around a moissanite stone, our custom design service handles the full process from concept to finished ring.

Moissanite vs Diamond: The Short Version

Moissanite is harder than sapphire and ruby, almost as hard as diamond, and significantly more brilliant in terms of light output. It costs a fraction of what a comparable diamond would cost. It is lab-created, which means no mining and no supply chain concerns. It comes with a GRA certificate and is built to last.

It is not a fake diamond. It is not a cheap imitation. It is a distinct gemstone that happens to look very similar to diamond and performs very well as an engagement ring stone.

For a full side-by-side comparison, read our moissanite vs diamond guide.

What to Do Next

Browse our full range of moissanite engagement rings, all made to order in Cape Town with a 4 to 6 week lead time. Every ring is available in 1ct, 2ct, and 3ct moissanite, set in your choice of metal.

If you need help with sizing before you order, our ring size guide covers three ways to measure accurately at home.

Any questions, send us a message on WhatsApp or email hello@moissaniteengagementrings.co.za and we will get back to you the same day.

Frequently Asked Questions About Moissanite

Is moissanite a real gemstone?

Yes. Moissanite is a real gemstone made from silicon carbide. It was first discovered in a meteorite in 1893. All moissanite sold today is lab-created because natural moissanite is too rare to mine commercially.

Does moissanite look like a diamond?

Moissanite looks very similar to diamond, especially indoors and in photographs. The main visible difference is that moissanite produces more coloured light flashes, called fire, in direct sunlight. Both stones are bright and colourless.

How hard is moissanite?

Moissanite rates 9.25 on the Mohs hardness scale. Diamond is the only gemstone harder, at 10. Moissanite is harder than sapphire, ruby, and all other common gemstones used in jewellery.

Will moissanite scratch or cloud over time?

Moissanite will not scratch under normal wear because it is harder than almost everything it comes into contact with. It will not cloud or lose its brilliance over time. A well-maintained moissanite ring looks the same after 20 years as it did when you bought it.

What is a GRA certificate?

A GRA certificate is issued by the Gemological Research Association and confirms a moissanite stone's identity, measurements, colour grade, and clarity grade. It is the standard certification for moissanite in South Africa. Every ring from Moissanite Engagement Rings SA includes a GRA certificate.

How much does a moissanite engagement ring cost in South Africa?

At Moissanite Engagement Rings SA, moissanite engagement rings start from R12,995 for a 1ct stone. A 2ct stone starts from R18,500 and a 3ct stone from R22,500. Price varies by ring design and metal choice.

Is moissanite a good choice for an engagement ring?

Yes. Moissanite is one of the most durable gemstones available, it maintains its brilliance over time, and it holds up to daily wear. It is a practical and beautiful choice for an engagement ring.

Can I get a custom moissanite engagement ring?

Yes. Moissanite Engagement Rings SA offers a custom design service where you can build a ring from scratch around your chosen stone and setting. Visit the custom design page to start the process.