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Help identifying this stone

I’m a stone hunter and just recently came across some really nice pieces.
This one piece, looks blackish but is actually a deep blue. I’m thinking possibly sapphire but would appreciate any input.
Thanks :blush:

TESTS! are needed for ID

SG test, this will eliminate a lot of variables

Rough saphire?

Hello:

You haven’t provided any information on the stone like where it came from, have you run any tests test on it etc.

I have some rocks that look very similar and mine are tumbled lava stones from the very north coast of Washington State.