What Is the Fake Diamond Called? Diamond Simulants Explained

The word fake is shorthand — useful in conversation, imprecise in meaning. When someone asks what the fake diamond is called, they are asking about a family of real gemstones engineered to resemble a mined diamond to the naked eye. The correct term is diamond simulant. The category spans cubic zirconia at one end, lab-created moissanite in the middle, and premium trademarked alternatives — such as Satéur Gems® — at the other. Diamond simulants are genuine gemstones, not imitations — each with its own optical character, durability tier, and value proposition.

Understanding Diamond Simulants

A diamond simulant is any lab-created or natural gemstone that closely resembles a mined diamond to the naked eye without sharing its chemical make-up. The category is defined entirely by visual outcome and wearability — not by intent to deceive.

Calling these stones "fake" flattens a meaningful distinction. Moissanite is as real as a ruby. Cubic zirconia is a genuine crystalline compound. Satéur Gems® is a trademarked gemstone with documented specifications. These are diamond alternatives — independently valuable, honestly presented.

The quality ceiling has risen sharply over recent years. Earlier simulants were straightforward to identify: soft, short-lived, optically imprecise. Contemporary precision-cut variants — particularly premium trademarked gemstones — close the gap to near-imperceptibility to the naked eye. That shift is what has turned the simulant category from a compromise into a legitimate choice.

Common Diamond Simulant Materials

Four materials account for most of the market. Each has a distinct optical profile, durability, and price point.

Cubic Zirconia

Cubic zirconia (CZ) is the most widely produced simulant. Composed of zirconium dioxide, it is optically clear when new and produces a colourful, high-dispersion sparkle. At ~8.0–8.5 Mohs, CZ is susceptible to surface abrasion under daily wear. Most specimens begin to cloud within 6–12 months as microscopic scratches scatter incoming light. It is the most affordable entry point in the category; longevity is its primary limitation.

Moissanite

Moissanite is a lab-created gemstone of silicon carbide, first found in meteorite fragments in 1893. Its refractive index of ~2.65 — versus ~2.42 for mined diamond — and dispersion of 0.104 (versus 0.044) produce approximately 2.4 times the fire of a mined diamond. That vivid, rainbow-forward sparkle is beautiful but distinctly not diamond. At ~9.25 Mohs, moissanite is extremely durable and holds its optical character indefinitely. Moissanite is openly disclosed as its own gemstone category — not a diamond substitute.

White Sapphire

White sapphire (corundum, 9.0 Mohs) is durable but optically muted — low refractive index (1.77) and minimal dispersion produce a soft, glassy appearance rather than diamond's sharp brilliance. It does not closely replicate the visual character of mined diamond and tends to read as "milky" in direct light.

Satéur Gems® and Trademarked Simulants

At the premium end, a small number of engineered trademarked simulants target a precise outcome: the look of a flawless D-colour mined diamond, not more fire than one. Satéur Gems® is the leading example — a proprietary gemstone with D-E colour grading, Excellent cut, and ~8.8 Mohs hardness. The composition is not publicly disclosed. What is documented is the output: clean white brilliance that reads as a flawless diamond to the naked eye, from £88.

Cubic Zirconia vs. Moissanite vs. Satéur Gems®

A direct comparison of the three most commonly considered simulants clarifies the key trade-offs.

The distinction that matters most for buyers chasing the mined diamond look: moissanite's high dispersion returns vivid rainbow fire — beautiful, but different. Satéur Gems® at ~2.39 RI sits closest to mined diamond (~2.42) and is engineered for that restrained, white scintillation. For an engagement ring where the goal is to wear the diamond look, the choice between the two is an aesthetic one.

What Makes a Diamond Simulant Visually Distinct

Three properties govern how closely a simulant reads like a mined diamond: refractive index, dispersion, and cut precision.

Refractive index determines how light bends inside the gemstone. Mined diamond: ~2.42. Satéur Gems®: ~2.39 — the closest match. Moissanite: ~2.65 — significantly higher, which is why it returns more spectral colour than a natural stone. Higher RI does not mean "more like a diamond"; it means more fire, which reads as less diamond-accurate.

Dispersion splits white light into spectrum. Mined diamond: 0.044. Moissanite: 0.104 — approximately 2.4 times higher. That gap is visible in natural light across a room. Satéur Gems® is engineered to the diamond end of this spectrum, not the moissanite end.

Cut matters independently of material. Both moissanite and Satéur Gems® are cut to Excellent grade as standard — the same specification as premium mined diamonds. Cubic zirconia cut quality varies widely by manufacturer.

Satéur Gems®: The Comparative Value Alternative

Satéur Gems® was developed to replicate the look of a flawless, D-colour mined diamond — not to exceed it in fire, not to approximate it cheaply, but to match its visual character as precisely as the material allows. The specification confirms it: D-E colour, Excellent cut, ~8.8 Mohs. The gemstone reads as a flawless diamond to the naked eye and across the table in natural light.

A comparable mined diamond would cost £7,000–£12,000. Satéur Gems® begins at £88 — approximately 1% of that price. That figure is not a compromise. It is a deliberate repositioning of where jewellery value lives. The The 1% Ring® collection is the flagship expression of this: the presence of a £10,000 mined diamond, chosen with full clarity of what it is and why that choice is the intelligent one.

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Engagement Rings with Diamond Simulants

The engagement ring category has seen the most significant shift toward simulants over the past decade. The financial context is clear: the average mined diamond engagement ring in the UK costs between £4,500 and £8,000. A moissanite or Satéur Gems® ring at a fraction of that is not a budget concession — it is a different philosophy applied to the same visual outcome.

Both moissanite (~9.25 Mohs) and Satéur Gems® (~8.8 Mohs) are built for daily wear in fine jewelry settings. The practical difference between 8.8 and 9.25 in daily life is negligible — neither clouds, neither requires special care, neither loses brilliance under normal wear. Cubic zirconia's degradation timeline makes it less suited to a piece worn constantly over decades.

The cultural framing has also shifted. Simulant engagement rings no longer read as economic compromises — they read as informed ones. For buyers exploring this path, the full guide to diamond simulant names and materials covers the vocabulary in detail.

Durability and Longevity of Diamond-Look Gemstones

The Mohs hardness scale measures scratch resistance. Mined diamond sits at 10. Simulants sit below that — but not by a margin that affects daily wear for most buyers.

Cubic zirconia at ~8.0–8.5 scratches progressively under daily abrasion. Surface damage scatters light and produces the characteristic clouding of older CZ rings. Most specimens degrade noticeably within 12 months of constant wear.

Moissanite and Satéur Gems® are a different tier entirely. Both are harder than natural sapphire (9.0 Mohs). Neither clouds. Neither loses its optical character under normal daily conditions. For engagement rings or daily-wear pieces intended to last decades, both materials hold their brilliance for life and require no special maintenance.

FAQ: Diamond Simulants and Diamond-Look Stones

The question "what is the fake diamond called" holds within it a more interesting question: what does a gemstone actually need to be? Diamond simulants are a mature, technically sophisticated category. The best of them do not ask to pass as something they are not — they offer the diamond look, honestly, at a fraction of the price. That is The New Diamond Standard.