Precious
Valuable
noun, な adjective
Something that's valuable and heavy is extremely precious and probably even more valuable than your less heavy things.
貴重 is used especially when something is rare, important, or hard to replace. You can use it for physical things, but you'll see it used to show appreciation for intangible things too, like 貴重なご意見 (your valuable opinion) or 貴重な体験 (a precious experience).
This is a jukugo word that uses the on'yomi readings of the kanji. You didn't learn this reading for 重 with the kanji, so here's a mnemonic to help you:
Keep things precious to you very close, because the evil Mrs. Chou (ちょう) will come and steal them away if you don't. She'll take all the valuable things you have and destroy them.
貴重なもの
valuable thing
貴重な経験
valuable experience
貴重な時間
valuable time
貴重な情報
valuable information
その本は今では非常に貴重です。
That book is extremely rare now.
貴重なご意見を有難うございます。
Thank you for your valuable opinions.
その体験は彼にとって貴重な学びになった。
That experience became a valuable lesson for him.
これ以上、貴重な時間をムダにしたくないんです。
I don't want to waste any more of my precious time.