Blue Topaz

Mineral Group: Topaz Group

Key Properties

Property Value
Mohs Hardness 8.0 (8)
Typical Size 1-100+ carats (commercial: 5-50 carats; large clean stones readily available)
Typical Price Range $10-200+ per carat (commercial: $20-100; Swiss blue $80-150; London blue $100-200+)
Rarity Level Limited Occurrence
Availability Level Readily Available
Availability Driver Readily Available
Investment Appropriateness Fashion/Trend Gems

Pricing

Typical Price
N/A
per carat
Listing Price
$13.05
per carat
Sold Price
$1.77
per carat
Discount Level
N/A
vs typical

Price Calculator

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

Rarity Description: Blue topaz colored by iron; most commercial blue topaz is irradiated. Swiss blue and London blue varieties most valued. Abundant supply from Brazil.

Availability Description: Widely available through gem dealers and jewelry retailers; irradiated material common; natural blue rare.

Investment Description: Popular blue gem; irradiation treatment standard; limited investment potential; fashion-driven market; good for personal jewelry.

BEARISH
34.38

Score Components

Geo rarity
65
Mkt availability
35
Invest Appr
25
hardness
0
price
25

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Investment Ranking Calculation

The composite score of 34.38 is calculated using a weighted formula:

  • Geological Rarity (25%): 65 points
  • Market Availability (25%): 35 points
  • Investment Appropriateness (25%): 25 points
  • Hardness (12.5%): 0 points
  • Price Range (12.5%): 25 points

Formula: (65 × 0.25) + (35 × 0.25) + (25 × 0.25) + (0 × 0.125) + (25 × 0.125) = 34.38

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