Gold
noun, suffix
The kanji and the word are exactly the same. That means they share meanings as well.
きん
Since this word is made up of a single kanji you would normally think it uses the kun'yomi reading. Not this word, though. It still uses the on'yomi reading, which you learned with the kanji. Don't confuse this one with お金, though. That one uses kun'yomi which you know because it has a hiragana attached.
金のネックレスをプレゼントしました。
I gave her a gold necklace.
お金があったら、金正ウンとおそろいの、金のロレックスをかいたいとおもっています。
If I had money, I would like to buy the gold Rolex that Kim Jong-un has.
この毛糸は24時間後に金に変わるんだけど、クリスマスプレゼントとして少しあんたにあげるよ。感謝しろよな。
This yarn will turn into gold in 24 hours and I’ll give you some as a Christmas present, so you should appreciate me more.