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Sandra: your article is very informative but your evaluation of blue
chalcedony is incorrect... Ellensburg blue- based on iron ion #4 is
the rarest of the chalcedony garnering $270 a carat for the gem
grade.. it has a blue to gray blue color and has a unique red
cast... it will change color intensity with changes in body heat and
humidity... also it changes after you bring it down to sea level
unless it is a very stable piece... just another two cents for the
pot!...God bless America...ringman
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