高価

In a sentence

• この時計は非常に高価です。

  This watch is very expensive.

  Here, 高価 is used as an adjective to describe the watch as being expensive, emphasizing its high price.

• その絵画の高価さが彼を驚かせました。

  The expensiveness of the painting surprised him.

  In this sentence, 高価さ is the noun form derived from 高価, indicating the characteristic of being expensive.

• 高価なものを買うときは慎重になりましょう。

  Be cautious when purchasing expensive items.

  Here, 高価 is used as part of the adjective 高価な, referring to items of high cost in general.