Staurolite

Mineral Group: Staurolite Group

Key Properties

Property Value
Mohs Hardness 7.25 (7-7.5)
Typical Size 0.5-5 carats (commercial: 1-3 carats; faceted stones rare and small)
Typical Price Range $30-200 per carat (commercial: $50-150; faceted stones rare)
Rarity Level Limited Occurrence
Availability Level Limited Supply
Availability Driver Limited Deposits
Investment Appropriateness Non-Investment Gems

Detailed Descriptions

Rarity Description: Often found as twinned crystals; gem-quality pieces are uncommon and mainly collectible.

Availability Description: Mostly sold as distinctive twinned specimen pieces to collectors; facetable material is rare.

Investment Description: Primarily specimen interest for twinned crystals; faceted stones extremely rare; no investment market; collector curiosities only.

Colors

Buy This Gem

Buy on Gem Rock Auctions Buy on Best In Gems

Investment Ranking Calculation

The composite score of 40.0 is calculated using a weighted formula:

  • Geological Rarity (25%): 65 points
  • Market Availability (25%): 65 points
  • Investment Appropriateness (25%): 5 points
  • Hardness (12.5%): 25 points
  • Price Range (12.5%): 25 points

Formula: (65 × 0.25) + (65 × 0.25) + (5 × 0.25) + (25 × 0.125) + (25 × 0.125) = 40.0

BEARISH
40.0

Score Components

Geo rarity
65
Mkt availability
65
Invest Appr
5
hardness
25
price
25