Opal Precious Stones

I have 2) Opal Precious Stones, 1) Oval & 1) Teardrop. I was quoted $50.00 for the large stone and $25.00 for the smaller one. I had a jewelry store give me an estimate on the value and it was $75.00 I am asking for 50% of the value of these precious stones. These Precious Stones can be used for a Custom Ring, Necklace or Earrings.