An authentic work created by the original artist (as opposed to a forgery or fake).
専門家の鑑定でその絵は真作と認められた。
An expert appraisal determined that the painting is authentic.
真作を買うためには証明書や来歴を確認することが重要だ。
To buy an authentic work, it's important to check certificates and provenance.
市場では真作と贋作の区別が難しいことがある。
In the market, it can be difficult to distinguish authentic works from forgeries.