Are these real diamonds or only sham?

这些是真钻石还是膺品？

Set of stamps in the above designs and in a third design showing a woman quilling was prepared in 1920, but not issued price of set, $4, exist with “SPECIMEN” overprint and imperf counterfeits exist.

1920年美，因印刷套印错误，未发行，存世仅有和有缺陷伪造（膺品）。