Stone That's Made Under Pressure
This page is the CodyCross answer for the clue below from Babies and Toddlers, Group 1663, Puzzle 4 (Nursery Rhymes).
Question is: Stone That's Made Under Pressure
and the answer is: DIAMOND
Word Meaning:
DIAMOND — (uncountable) A glimmering glass-like mineral that is an allotrope of carbon in which each atom is surrounded by four others in the form of a tetrahedron.
Definitions from Wiktionary.