150 pp ? if you pay that, you are a dumb :)
The price for the gold is around 11.5 pp qnd for the gem is 1.5pp. If you consider the work factor (x2) it make :
(11.5+1.5)x2 = 26 pp
Maybe the chanters on your server are... hmmm rogues ? :p
150pp is more a price for a cheap Silver saphirre Neckless (INT 4 Str 4).