Well, are they?
I felt attaching a pic of one of my dogs was appropriate
Not usually but it happens periodically.
That appears to be an underwater cave.
Your dog looks unhappy. Still looks cute.
I’ve never seen gems underwater.
Buddy, it looks like your world is corrupted from that picture. I know it may not be, but still.
I think it’s just an oddly formed underwater cave.
Underwater caves in oceans are common and can be found on most worlds. Gems are found anywhere underground on stone backwalls, including those found in oceans.