Black Star Sapphire

Hardness: 9.0

Occurrence: Myanmar (Burma), Thailand, India, Sri Lanka (Ceylon), Tanzania, Afghanistan, Australia, Brazil, Cambodia, Malagasy Republic, Malawi, Pakistan, Zimbabwe (Rhodesia), United States (Montana, North Carolina).

Appearance: Black sapphires are found in the form of star sapphires. These dark six-rayed stars are very attractive. These can be confused with Star Diopside which only have a four-rayed star.

Enhancements: Black star sapphire is always heat treated to produce, intensify or lighten color and/or improve color uniformity and appearance. Many dealers will fill the natural cracks and fissures on the bottom of the cabs. PSU does not follow that practice.
    Shape Size Avg. Wt Color Grade Cost Each
  MQ 6.0/3 .25-.40 Brown black Fine star $  5.00
  MQ 8.0/4 .60-.90 Brown black Fine star $ 15.00
  MQ 10.0/5 1.10-1.40 Brown black Fine star $ 45.00
  MQ 12.0/6 2.80-3.35 Brown black Fine star $125.00
             
  OV 5.0/3 0.22-0.30 Brown black Fine star $4.00
Top View   OV 6.0/4 0.66-.85 Brown black Fine star $12.00
  OV 7.0/5 0.90-1.35 Brown black Fine star $20.00
  OV 8.0/6 1.75-2.05 Brown black Fine star $35.00
  OV 9.0/7 2.15-2.75 Brown black Fine star $85.00
  OV 10.0/8 3.80-4.75 Brown black Fine star $100.00
  OV 11.0/9 4.40-5.75 Brown black Fine star $150.00
  OV 12.0/10 6.00-7.50 Brown black Fine star $375.00
  OV 14.0/12 11.84 Brown black Fine star $655.00
  Bottom   OV 15.6/11.8 7.25 Brown black Flat $168.00
             
  PS 6.0/4 0.50-0.70 Brown black Fine star $8.00
  PS 7.0/5 0.80-1.00 Brown black Fine star $12.00
  PS 8.0/6 1.05-1.25 Brown black Fine star $25.00
  PS 9.0/6 1.78-2.25 Brown black Fine star $40.00
  PS 10.0/7 2.30-2.80 Brown black Fine star $50.00
             
    RD 2.5 0.20-0.25 Brown black Fine star $2.00
  RD 3.0 0.22-0.28 Brown black Fine star $4.00
  RD 4.0 0.33-0.45 Brown black Fine star $6.00
  RD 5.0 0.55-0.70 Brown black Fine star $9.00
  RD 6.0 0.85-1.05 Brown black Fine star $15.00
  RD 7.0 1.50-1.75 Brown black Fine star $20.00
  RD 8.0 2.00-2.40 Brown black Fine star $30.00

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