Of a sample of 198 aged pestles (2 stacks) purchased at the vendor, I recieved via desynth:
13 HQ Aged Pestle Pieces (6.56%)
31 NQ Aged Pestle Pieces (15.66%)
18 HQ Iron Ingot (9.09%)
45 NQ Iron Ingot (22.73%)
20 HQ Steel Ingot (10.10%)
52 NQ Steel Ingot (26.26%)
19 Clear Demimateria II (9.60%)
The cost for 1 Aged Pestle Pieces (NQ or HQ), is ~13,500 gil.