Moissanite vs Diamond: What's the Real Difference?
When you're choosing a centrepiece stone for a ring, necklace, or pair of earrings, the question of moissanite vs diamond comes up fast. Both are beautiful. Both sparkle. But they are different stones — and understanding those differences will help you make a decision you'll be happy with forever.
Here's an honest, straightforward comparison.
What Are They Made Of?
Diamond is pure carbon, formed naturally deep within the Earth over billions of years. It is the hardest natural substance known.
Moissanite is silicon carbide, originally discovered in a meteor crater. Today it is lab-created, with the exact same properties as naturally occurring moissanite. Both are real gemstones — one is mined, one is grown.
Sparkle: Which One Catches the Light More?
Here's something that surprises a lot of people: moissanite actually sparkles more than diamond.
Moissanite has a higher refractive index (2.65–2.69 vs diamond's 2.42), which means it bends light more intensely. This produces a rainbow "fire" — that colourful flash you see when light hits it. Diamonds produce more of a brilliant white sparkle.
Whether you prefer one over the other is entirely personal. Many people find moissanite's fire absolutely dazzling. Others prefer the classic white brilliance of diamond. Both are stunning in real life.
Hardness & Durability: Which Lasts Longer?
Diamond: 10/10 on the Mohs scale — the hardest natural substance
Moissanite: 9.25/10 — the second hardest gemstone
For everyday jewellery, this difference is negligible. Moissanite is highly resistant to scratching, chipping, and breaking, making it perfectly suited for engagement rings, daily-wear rings, and fine jewellery pieces you never want to take off.
Price: The Biggest Difference
This is where the comparison becomes very clear. For equivalent stone sizes:
Diamond (1 carat, VS1 clarity, G colour): $5,000–$15,000+ AUD
Moissanite (1 carat equivalent): $400–$800 AUD
Moissanite costs approximately 80–90% less than a comparable diamond. You can choose a significantly larger moissanite for the same budget, or invest that saving elsewhere — a honeymoon, a home deposit, more jewellery.
Ethics & Sustainability
Natural diamonds involve significant mining activity, which can have environmental and social impacts. While the industry has improved, issues around conflict diamonds and ecosystem damage remain concerns for many buyers.
Moissanite is lab-created — no mining, no environmental destruction, no ethical grey areas. For environmentally-conscious shoppers in Australia, this is a meaningful difference.
Can People Tell the Difference?
To the naked eye, in everyday lighting — no. Moissanite and diamond look nearly identical. Even trained jewellers need specialised equipment to tell them apart in most settings.
The practical differences you might notice over time: moissanite's rainbow flash in direct sunlight vs diamond's white sparkle. That's really the main visual distinction.
Which Should You Choose?
Choose diamond if: you want the traditional prestige of a natural stone, budget is not a concern, and you prefer classic white brilliance.
Choose moissanite if: you want exceptional sparkle and beauty, ethical sourcing matters to you, you want to maximise your stone size for your budget, or you want stunning everyday jewellery without the diamond price tag.
At Byrall, we believe you shouldn't have to choose between beauty and value. That's why every piece in our collection uses premium moissanite — set in 925 sterling silver — so you get genuine luxury you can wear every single day.
See our latest editions.
Browse our rings and necklace collections and find your perfect piece.
— Byrall Jewellery Australia
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