i-adjective
valuable; of high value
Describes something that has high worth or merit. Often used in formal or written contexts.
この絵はとても価値高い。
This painting is very valuable.
彼の意見は価値高いものだ。
His opinion is something of high value.
価値がある is a common phrase meaning 'to have value'. 価値高い is a single adjective that emphasizes the high degree of that value.
Compound of 価値 (kachi, 'value') + 高い (takai, 'high'). The reading かちたかい follows standard rendaku voicing of たかい.