The thickness of the gem portion is another factor in determining value. The price of opal doublets ranges from approximately $24 to $160 per stone, with the price determined by the same factors that govern the value of black and white opals, as described above.
No, if there are multiple cracks then the denture can not be repaired. You have to get the new denture made. The cost of the lower denture will vary between $600 to $800 depending upon the place and the dentist.
Lower dentures should cost the same as upper dentures. Depending on the state and area you live in, they could range from $700 to $900 per piece. You may still be charged for an exam, x-rays and for any extractions that need to be done.