Tourmaline

Mineral Group: Tourmaline Group

Key Properties

Property Value
Mohs Hardness 7.25 (7-7.5)
Typical Size 0.5-50+ carats (commercial: 1-20 carats; large stones available)
Typical Price Range $20-500+ per carat (commercial: $50-200; variety dependent)
Rarity Level Common Gemstones
Availability Level Consistently Available
Availability Driver Consistent Deposits
Investment Appropriateness Fashion/Trend Gems

Pricing

Typical Price
$40.00
per carat
Listing Price
$121.78
per carat
Sold Price
$57.17
per carat
Discount Level
1.4
vs typical

Price Calculator

Estimate Type Total Value Price per Carat
Typical Cost - -
Likely Listed Cost - -
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Detailed Descriptions

Rarity Description: Boron silicate mineral group with many color varieties. Generic tourmaline entry for name matching priority. Includes rubellite, indicolite, verdelite, and more.

Availability Description: Widely available worldwide; Brazil major source; many color varieties available.

Investment Description: Common gem group; specific varieties may have investment value; generic tourmaline mainly decorative.

VERY BEARISH
17.5

Score Components

Geo rarity
0
Mkt availability
10
Invest Appr
25
hardness
25
price
45

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Investment Ranking Calculation

The composite score of 17.5 is calculated using a weighted formula:

  • Geological Rarity (25%): 0 points
  • Market Availability (25%): 10 points
  • Investment Appropriateness (25%): 25 points
  • Hardness (12.5%): 25 points
  • Price Range (12.5%): 45 points

Formula: (0 × 0.25) + (10 × 0.25) + (25 × 0.25) + (25 × 0.125) + (45 × 0.125) = 17.5

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