October birthstone – Opal

October is another month with two official birthstones.  If you are partial to wondrously terminated hard crystalline faceted gemstones, perhaps tourmaline would be your preferred choice.  But, if you like the rainbow play of colors offered by opal, then stones cut to display the remarkable lustrous character of precious opal may touch your fancy.  Since I’ve already written about tourmaline, let’s focus on opal in this birthstone review.

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