Does anyone here catch oysters? If so how?

Plz Underwater techniques, where I live there's not any on the shore.
I don't use goggles or any swimsuit, is it possible to still catch em? What do they look like .
When I dive I find white circles glowing, I tried catching it but it was a rock. I saw people around me catching some but they were far and had a boat.
Where r they located? Between rocks or bottom of the ocean? Do they glow?
I might consider buying goggles if it's not possible without it.