Where does cobalt blue sea glass come from?

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Iridescent Cobalt Blue Davenport Sea Glass

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Cobalt blue sea glass. #beach #seaglass #shorts

Beautiful blue sea glass. #beautiful #blue #SeaGlass

Pretty blue sea glass. #blue #beach #SeaGlass

~ Very Strange Cobalt Blue Sea Glass! Clip #10 From My "Cape Breton Sea Glass At It's Best" Video

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COBALT BLUE GLASS VASE @ GOODWILL #thrifting #goodwill #vase #glass #homedecor #blue #thriftwithme

Cobalt Sea Glass

🦋Blue cobalt SEAGLASS. Beachcombing in the WEST coast of IRELAND