In its purest form, a knife is an authentic tool. Jewelry made into the shape of a knife is not a knife. And, when a knife ceases to be a Tool, it ceases to be a knife.
Generally speaking, authentic people have the capacity to appreciate authentic things.
of undisputed origin; genuine:
"the letter is now accepted as an authentic document" · [more]
synonyms: genuine · real · bona fide · true · veritable · legitimate · lawful · legal · [more]
made or done in the traditional or original way, or in a way that faithfully resembles an original:
"the restaurant serves authentic Italian meals" · [more]
based on facts; accurate or reliable:
"an authentic depiction of the situation"
synonyms: reliable · dependable · trustworthy · authoritative · honest ·