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• The remaining market share is made of mainly opals, pearls and other gems such as sapphires and chrysoprase. ... Australia produces around 95%t of the world's opals for use in the jewellery industry. ...
  http://www.ice.it/paesi/oceania/australia/upload/193/Sector%20outlook_Jewellery%20Industry%2009%20(eng).pdf
• OPALS Tutorial Cards ? Manual Entry - Book Template. 5. Screen displays MARC tag ... OPALS Tutorial Cards ? Manual Entry - Book Template. 8. Enter relevant data in applicable ...
  http://www.opals-na.org/pdf/OPALSTutorialCard-MARCEditorManualEntry-1.pdf
• opals of 300-nm silica spheres using a novel high pressure?high temperature technique. ... A pronounced photonic stop band in the visible spectral range was found in both the plain and Ga in?ltrated opals. ...
  http://www.physics.utah.edu/~vkozhev/Proof%20Gallium%20opals.pdf
• According to the expert, opals are among the most difficult-to-grade stones, largely because. of their unique range of color characteristics. " Qualities such as 'flash', the way an opal. reflects light and color as it is rotated, can vary wit
  http://news.softpedia.com/newsPDF/New-Grading-Technology-Classifies-Opals-120552.pdf
• the white opal, but there are also black opals, ?re opals, ... old superstition that it's bad luck to wear opals, you can. still have a reasonable facsimile of this ...
  http://www.polymerclayweb.com/opals.pdf