Amazing quality prehnite gemstone Unheated/ Untreated/ Undyed.
Natural green black prehnite flatback cabochon gemstone.
Translucent prehnite crystal clear stone loose gemstone.

All sizes oval shape calibrated :-

6X4 MM
7X5 MM
8X6 MM
9X7 MM
10X8 MM
11X9 MM
12X8 MM
12X10 MM
13X9 MM
14X10 MM
16X12 MM