Iolite
Mineral Group: Cyclosilicate Group
Key Properties
| Property | Value |
|---|---|
| Mohs Hardness | 7.25 (7-7.5) |
| Typical Size | 1-20 carats (commercial: 2-10 carats; medium sizes common, very large stones less available) |
| Typical Price Range | $50-300 per carat (commercial: $80-200; strong pleochroism valued) |
| Rarity Level | Limited Occurrence |
| Availability Level | Readily Available |
| Availability Driver | Readily Available |
| Investment Appropriateness | Fashion/Trend Gems |
Detailed Descriptions
Rarity Description: Pleochroic gem that occurs in metamorphic rocks; good faceting material is not abundant.
Availability Description: Available from major gemstone dealers in a range of sizes; used widely in commercial jewelry and online retail.
Investment Description: Moderate availability with pleochroism appeal; fashion-driven jewelry market; limited investment potential; suitable for personal enjoyment.
Colors
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Investment Ranking Calculation
The composite score of 37.5 is calculated using a weighted formula:
- Geological Rarity (25%): 65 points
- Market Availability (25%): 35 points
- Investment Appropriateness (25%): 25 points
- Hardness (12.5%): 25 points
- Price Range (12.5%): 25 points
Formula: (65 × 0.25) + (35 × 0.25) + (25 × 0.25) + (25 × 0.125) + (25 × 0.125) = 37.5
BEARISH
37.5
Score Components
Geo rarity
65
Mkt availability
35
Invest Appr
25
hardness
25
price
25