Alexandrite

Mineral Group: Chrysoberyl Group

Key Properties

Property Value
Mohs Hardness 8.5 (8.5)
Typical Size 0.25-10 carats (commercial: 0.5-3 carats; stones over 5 carats with strong change are very rare)
Typical Price Range $5,000-70,000+ per carat (commercial: $10,000-30,000; strong change Russian $40,000-70,000+)
Rarity Level Singular Occurrence
Availability Level Museum Grade Rarity
Availability Driver Small Crystal Size
Investment Appropriateness Blue Chip Investment Gems

Detailed Descriptions

Rarity Description: Color-change chrysoberyl that forms under very specific conditions; collector-grade examples are rare.

Availability Description: Market supply is driven by gem-quality color-change pieces which appear rarely at auction and through specialist dealers.

Investment Description: Strong color-change alexandrite from Russia or Brazil highly sought; established collector market with proven appreciation; investment-grade requires strong color change; excellent long-term potential.

Colors

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Investment Ranking Calculation

The composite score of 87.5 is calculated using a weighted formula:

  • Geological Rarity (25%): 100 points
  • Market Availability (25%): 100 points
  • Investment Appropriateness (25%): 100 points
  • Hardness (12.5%): 0 points
  • Price Range (12.5%): 100 points

Formula: (100 × 0.25) + (100 × 0.25) + (100 × 0.25) + (0 × 0.125) + (100 × 0.125) = 87.5

VERY BULLISH
87.5

Score Components

Geo rarity
100
Mkt availability
100
Invest Appr
100
hardness
0
price
100