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Showing below up to 20 results in range #1 to #20.

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  1. (hist) ‎Faceting Designs ‎[151,295 bytes]
  2. (hist) ‎Refractometer ‎[54,784 bytes]
  3. (hist) ‎Origin determination ‎[41,989 bytes]
  4. (hist) ‎Polariscope ‎[32,685 bytes]
  5. (hist) ‎Causes of color ‎[25,676 bytes]
  6. (hist) ‎Luminescence ‎[22,983 bytes]
  7. (hist) ‎Course:Refractometer ‎[19,815 bytes]
  8. (hist) ‎Diamond ‎[18,756 bytes]
  9. (hist) ‎Amber ‎[18,083 bytes]
  10. (hist) ‎Opal ‎[17,948 bytes]
  11. (hist) ‎Garnet ‎[17,317 bytes]
  12. (hist) ‎Glossary of Terms ‎[17,239 bytes]
  13. (hist) ‎Pearl ‎[16,313 bytes]
  14. (hist) ‎Gemstone Treatments and Enhancements ‎[15,437 bytes]
  15. (hist) ‎Heat Treatment ‎[14,250 bytes]
  16. (hist) ‎Spinel ‎[14,009 bytes]
  17. (hist) ‎Sapphire ‎[11,330 bytes]
  18. (hist) ‎Course:Total internal reflection ‎[11,160 bytes]
  19. (hist) ‎Ruby ‎[10,696 bytes]
  20. (hist) ‎Origins of minerals ‎[10,679 bytes]

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