Comparison · Semi-Precious Stones vs Minerals
Aquamarine vs Celestine
Aquamarine and Celestine are easy to confuse. Aquamarine is harder (Mohs 7.5) than Celestine (Mohs 3–3.5), so Aquamarine will scratch Celestine and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Aquamarine and Celestine
- Aquamarine is harder (Mohs 7.5) than Celestine (Mohs 3–3.5), so Aquamarine will scratch Celestine and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
- Celestine feels noticeably heavier for its size (specific gravity 3.95–3.97 versus 2.7 for Aquamarine).
- Hold a thin edge to the light: Aquamarine is transparent, Celestine is Transparent to translucent.
- They overlap in blue and green, but Celestine also comes in clear, gray, and orange.
- Well-formed crystals give it away: Aquamarine is hexagonal, Celestine is Orthorhombic.
Aquamarine vs Celestine properties
| Property | Aquamarine | Celestine |
|---|---|---|
| Type | Semi-Precious Stones | Minerals |
| Mohs hardness | 7.5 | 3–3.5 |
| Luster | vitreous | Vitreous, pearly on cleavage |
| Streak | White | White |
| Transparency | transparent | Transparent to translucent |
| Specific gravity | 2.7 | 3.95–3.97 |
| Crystal system | hexagonal | Orthorhombic |
| Common colors | Light Blue, Blue-Green, Greenish Blue | Colorless, Pale blue, White, Gray, Light green, Orange (rare) |
| Rarity | uncommon | common |
| Typical specimen value | $50–$5000+ | $2–$150+ |
Which is more valuable?
Aquamarine is usually the more valuable of the two: a typical collector specimen runs about $300 against $20 for Celestine, and premium Aquamarine can reach $5000 or more.
About Aquamarine
Aquamarine is a blue variety of beryl, the same mineral family as emerald. Its name means 'water of the sea' in Latin.
About Celestine
Celestine, also spelled celestite, is strontium sulfate, SrSO4, and the primary ore of strontium, crystallizing in the orthorhombic system. It is best known for growing in delicate pale blue, tabular crystals, a color that gave the mineral its name from the Latin caelestis, meaning heavenly. Celestine often forms alongside gypsum and calcite in sedimentary evaporite settings, distinguishing it from most other sulfate minerals of hydrothermal origin.
Aquamarine vs Celestine FAQ
Is Aquamarine the same as Celestine?
No. Aquamarine is a semi-precious stone while Celestine is a mineral. Aquamarine is harder (Mohs 7.5) than Celestine (Mohs 3–3.5), so Aquamarine will scratch Celestine and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
How can you tell Aquamarine from Celestine?
Aquamarine is harder (Mohs 7.5) than Celestine (Mohs 3–3.5), so Aquamarine will scratch Celestine and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Celestine feels noticeably heavier for its size (specific gravity 3.95–3.97 versus 2.7 for Aquamarine). Hold a thin edge to the light: Aquamarine is transparent, Celestine is Transparent to translucent.
Which is harder, Aquamarine or Celestine?
Aquamarine is harder: Mohs 7.5 against Mohs 3–3.5 for Celestine.
Which is more valuable, Aquamarine or Celestine?
Aquamarine is usually the more valuable of the two: a typical collector specimen runs about $300 against $20 for Celestine, and premium Aquamarine can reach $5000 or more.
