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The Other October Birthstone - Tourmaline - By: blog.RubyLane.com, 2010-02-20 While Opal is the most widely recognized birthstone for the month of October, it is not your only choice. Tourmaline, a complex mineral, comes in as many shades of color as are displayed in fine Opals, and the pink variety is widely accepted as an alternate birthstone for the month. COMMENTS Add a comment |