Blue Topaz
Mineral Group: Topaz Group
Key Properties
| Property | Value |
|---|---|
| Mohs Hardness | 8.0 (8) |
| Typical Size | 1-100+ carats (commercial: 3-50 carats; very large sizes readily available due to treatment) |
| Typical Price Range | $5-50 per carat (commercial: $10-30; treated material very abundant) |
| Rarity Level | Limited Occurrence |
| Availability Level | Consistently Available |
| Availability Driver | Readily Available |
| Investment Appropriateness | Non-Investment Gems |
Detailed Descriptions
Rarity Description: Natural blue topaz is uncommon; commercial blue topaz is nearly all treated (irradiated and heated) colorless topaz.
Availability Description: Extremely common in jewelry markets due to irradiation treatment; available everywhere at very affordable prices in all sizes.
Investment Description: Nearly all material is irradiated and heated; extremely abundant treated stones; no investment value whatsoever; mass-market jewelry use only.
Colors
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Investment Ranking Calculation
The composite score of 29.38 is calculated using a weighted formula:
- Geological Rarity (25%): 65 points
- Market Availability (25%): 10 points
- Investment Appropriateness (25%): 5 points
- Hardness (12.5%): 65 points
- Price Range (12.5%): 10 points
Formula: (65 × 0.25) + (10 × 0.25) + (5 × 0.25) + (65 × 0.125) + (10 × 0.125) = 29.38
VERY BEARISH
29.38
Score Components
Geo rarity
65
Mkt availability
10
Invest Appr
5
hardness
65
price
10