The gem that comes from the skeletons of tiny sea animals is called a coral. Deposits of corals usually accumulate to form reefs or islands in warm seas.
starfish
No its a mammal but it lives in the sea and then comes up for air above the surface of the ocean.
Some depictions show it as a brown, squirrelish creature with a red gem on it's head, but the more used version is a greenish blue creature with a red gem on its head.
single unicellular creature
the class of a sea creature is balanola silapaigen
a Caribbean sea creature
The Blue Whale is the largest sea creature known to date
What sea creature has 5 sets of jaws?
Creature from the Haunted Sea was created in 1961-06.
The duration of Creature from the Haunted Sea is 1.25 hours.
"Only" in the given sentence is an adjective, modifying the noun "gem".