Can anyone identify this for me

I recently came across a necklace that belonged to a deceased family member. I know that she was friends with a couple of people who did a lot of diving and this piece was given to her by one of them.
Just wondering if anyone can tell me anything about it at all.
I will attach two photos of it, front and back.
Thanks guys!!
Just wondering if anyone can tell me anything about it at all.
I will attach two photos of it, front and back.
Thanks guys!!
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We would love to help.
brass?