Aquamarine vs Emerald
Aquamarine and Emerald are commonly confused, and 1 measured property separates them — density most clearly.
Aquamarine vs Emerald
Aquamarine
Beryl coloured blue by iron — the same mineral as emerald, grown somewhere calmer, and usually clean because of it.
Emerald
Beryl coloured green by chromium — and the one major gemstone whose inclusions are expected rather than a fault.
| Property | Aquamarine | Emerald |
|---|---|---|
| Crystal system Categorical values can be listed side by side but not ordered or subtracted. | hexagonal | hexagonal |
| Density | 2.66–2.8 g/cm³ higher | 2.67–2.78 g/cm³ |
| Mohs hardness Mohs hardness is an ordinal scale: values can be ranked, but differences and ratios between them are not meaningful. | 7.5–8 | 7.5–8 |
Why these get confused
one mineral and two trace elements — the same hardness, density and crystal system, and a price difference of orders of magnitude
The confusion is a real and documented one, not a resemblance we have invented.