Weird material? Dodgy surface alteration? Crude carvings? Too plain looking? Poor condition? Resembles excavated piece?
As collectors filter through tons of pieces claiming to be Chinese Archaic Jade relics, it is advisable to add one more criterion and avoid what I call difficult collectibles. 很难说, 不太开门.
I would not classify these jade pieces as fakes or modern reproductions immediately, but it is simply too tricky. Essentially, I am trying to reduce the potential controversy in future if I wish to seek a second opinion on acquired jade pieces. In the absence of reliable provenance, exquisite carvings, workmanship and correct nephrite material would certainly help a great deal. If there are too many questions, it might not be worth collecting.