Paraiba Tourmaline
Mineral Group: Tourmaline Group
Key Properties
| Property | Value |
|---|---|
| Mohs Hardness | 7.25 (7-7.5) |
| Typical Size | 0.1-10 carats (commercial: 0.25-3 carats; stones over 5 carats are exceptionally rare) |
| Typical Price Range | $5,000-60,000+ per carat (commercial: $10,000-25,000; Brazilian neon $30,000-60,000+) |
| Rarity Level | Singular Occurrence |
| Availability Level | Museum Grade Rarity |
| Availability Driver | Limited Deposits |
| Investment Appropriateness | Emerging Investment Gems |
Detailed Descriptions
Rarity Description: Copper-bearing tourmaline with vivid neon blue-green color; original Brazilian deposits are nearly depleted, making it exceptionally rare.
Availability Description: Among the most expensive gems per carat; Brazilian material is exceptionally rare with African sources providing limited additional supply through elite dealers.
Investment Description: Brazilian copper-bearing tourmaline among most valuable gems per carat; original deposits nearly depleted; strong auction market and proven appreciation; excellent investment potential despite African sources.
Colors
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Investment Ranking Calculation
The composite score of 84.38 is calculated using a weighted formula:
- Geological Rarity (25%): 100 points
- Market Availability (25%): 100 points
- Investment Appropriateness (25%): 75 points
- Hardness (12.5%): 25 points
- Price Range (12.5%): 100 points
Formula: (100 × 0.25) + (100 × 0.25) + (75 × 0.25) + (25 × 0.125) + (100 × 0.125) = 84.38