MoissanitevsDiamond
Moissanite vs Diamond
At a Glance
Moissanite
Diamond
Optical Properties
Diamond wins| Criteria | Moissanite | Diamond |
|---|---|---|
| Refractive index of 2.65–2.69 — higher than diamond. Produces more total light return, which some perceive as 'too sparkly.' | Refractive index of 2.417. Produces the classic diamond sparkle that most consumers are calibrated to expect. | |
| Dispersion of 0.104 — 2.4x higher than diamond. Produces vivid rainbow flashes, especially in direct sunlight. This is the most visible difference between the two. | Dispersion of 0.044. Produces balanced fire and brilliance. Rainbow flashes are present but more subtle and integrated. | |
| The 'disco ball' effect becomes more pronounced above 1.5ct equivalent. Rainbow flashes can look artificial to trained eyes. | Maintains a consistent, balanced look at all sizes. Larger diamonds are more impressive without appearing artificial. |
Durability
Diamond wins| Criteria | Moissanite | Diamond |
|---|---|---|
| 9.25 on the Mohs scale — harder than sapphire, softer than diamond. Excellent scratch resistance for daily wear. | 10 on the Mohs scale — the hardest natural substance. Nothing scratches a diamond except another diamond. | |
| Good toughness. No cleavage planes, making it more resistant to chipping than diamond in some impact scenarios. | Excellent hardness but has cleavage planes. Diamonds can chip if struck at certain angles. | |
| Exceptional heat resistance — survives torch work during jewelry repair. Won't cloud or damage during setting. | Excellent heat resistance. Can withstand jeweler's torch for most setting and repair operations. |
Cost & Value
Diamond wins| Criteria | Moissanite | Diamond |
|---|---|---|
| $300–$600 for a premium-quality 1ct equivalent (6.5mm). About 90% less than a natural diamond. | $5,000–$8,000 for a natural 1ct G/VS2. $800–$1,500 for lab-grown equivalent quality. | |
| Minimal. No established secondary market. Buyback programs offer pennies on the dollar. | Natural diamonds retain 30–50% of retail. Lab-grown diamonds have minimal resale. Established auction and dealer networks for natural. | |
| Unbeatable value per millimeter. A 2ct-equivalent moissanite ($500–$800) matches the visual impact of a $15,000+ natural diamond. | Exponentially more expensive as size increases. Price per carat jumps significantly at 1ct, 1.5ct, and 2ct thresholds. |
Detection & Perception
Diamond wins| Criteria | Moissanite | Diamond |
|---|---|---|
| Experienced jewelers can often spot moissanite by its stronger fire and the 'doubling' effect visible through the table (moissanite is doubly refractive). | Singly refractive — no doubling effect. The visual characteristics that consumers associate with 'real diamond.' | |
| Passes basic diamond testers (thermal conductivity). Requires a moissanite-specific tester or SWUV light for definitive identification. | Passes all standard gemological tests. GIA/AGS certification provides definitive identification and grading. | |
| Increasingly accepted, especially among younger buyers. Some stigma remains around 'not being a real diamond.' | Universally recognized and accepted. Strong cultural association with commitment and luxury. |
The Verdict
Diamond wins