A valuable rock is a gem.
opal
Valuable. You were correct.
Jade
Valuable
A valuable looking rock is often referred to as a gemstone, precious stone, or a mineral specimen. These rocks are sought after for their rarity, beauty, and sometimes for their metaphysical or healing properties. Examples include diamonds, rubies, emeralds, and quartz crystals.
The word "valuable" is not a verb; it is an adjective.
valuable
They used dynamite to blow up the building.
The word rock is a solid thin
of value, valuable,
valuable
my treasure