noun
a gemstone, especially a diamond
adjective
of great value or high price; highly esteemed or cherished
adverb
in a way that shows great value or importance
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The diamond necklace was a precious family heirloom passed down for generations.
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I keep my precious memories in a special box under my bed.
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That vintage car is my precious baby, I polish it every weekend.
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Her time with loved ones is the most precious gift she could ask for.