Pearl

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Pearl

  1. 1. Pearl Mithat Konar 14 Jan 2009
  2. 2. Pearl • shape • color • rarity
  3. 3. Process
  4. 4. Natural pearls
  5. 5. Natural pearls • harvested from wild oysters and mussels • Bahrain and Australian Indian Ocean • extremely rare
  6. 6. Cultivated pearls
  7. 7. Cultivated pearls • oysters and mussels surgically implanted • placed in cages • left to develop • 2-7 years
  8. 8. Problems
  9. 9. Cruelty for beauty
  10. 10. Cruelty for beauty • cultivated pearls • many oysters do not survive implanting • most die during harvesting • survivors are implanted again
  11. 11. Cruelty for beauty • natural pearls • several tons of oysters are needed for a few perfect pearls
  12. 12. Eco-balance
  13. 13. Eco-balance • over-harvesting of wild stocks • threat from global warming • threat from pollution
  14. 14. Industry
  15. 15. Industry • pearl workers need to eat
  16. 16. A solution
  17. 17. A solution • High tensile strength mesh containers ... • full of rocks ... • full of waste glass ... + +
  18. 18. A solution • placed in moving water ... • allowed to develop into ... + =++
  19. 19. A solution • cultivated beach glass
  20. 20. Result
  21. 21. Result • gemstones • industry
  22. 22. Waste
  23. 23. Waste • sand
  24. 24. Objections
  25. 25. It's only glass
  26. 26. It's only glass • Pearls are only calcium carbonate and protein • Diamonds are only carbon
  27. 27. There's no skill involved
  28. 28. There's no skill involved • Determinants of form • initial glass size • rock size • wave/current type and intensity • process time
  29. 29. It's not rare
  30. 30. It's not rare • That's a problem?
  31. 31. References http://www.colored-stone.com/stories/sep07/chinesepearls.cfm http://ezinearticles.com/?Pearl-Farming!&id=951109 http://www.gratitude-rocks.com/images/Gratitude-Rocks%20stones.jpg http://www.imperial-deltah.com/Education/pearl_farming_around_the_world.htm http://www.jsbeads.com/Fresh-Water-Pearls/Your-Own-Peal-Farm.asp http://www.northernbrewer.com/wine-bottling.html http://www.khulsey.com/jewelry/kh_jewelry_cultured_pearls.html http://www.meshbagsandmore.com/Mesh/mesh.htm http://www.pacificislandtravel.com/fr_polynesia/about_destin/pearlfarming.html http://www.pearl-guide.com/pearl-farms.shtml http://en.wikipedia.org/wiki/File:Pearl.jpg http://en.wikipedia.org/wiki/File:Johannes_Vermeer_(1632-1675)_-_The_Girl_With_The_Pearl_Earring_(1665). jpg http://en.wikipedia.org/wiki/Freshwater_pearl_mussel http://en.wikipedia.org/wiki/Pearl http://en.wikipedia.org/wiki/Pearl_oyster

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