Coral

Heb. ramoth, meaning "heights;" i.e., "high-priced" or valuable
things, or, as some suppose, "that which grows high," like a
tree (Job 28:18; Ezek. 27:16), according to the Rabbins, red
coral, which was in use for ornaments.

The coral is a cretaceous marine product, the deposit by
minute polypous animals of calcareous matter in cells in which
the animal lives. It is of numberless shapes as it grows, but
usually is branched like a tree. Great coral reefs and coral
islands abound in the Red Sea, whence probably the Hebrews
derived their knowledge of it. It is found of different colours,
white, black, and red. The red, being esteemed the most
precious, was used, as noticed above, for ornamental purposes.