This section is from the book "Manual Of Useful Information", by J. C Thomas. Also available from Amazon: Manual of useful Information.
Emerald.................... | 277.5| |
Crystal.................... | 265.3| |
Diamond............ | 353.0 |
Topaz............... | 401.1 |
Garnet................... | 406.3 |
Ruby................., | 428.3 |
 
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