How much does the minrals cost

The minerals vary in price. I would just call the store and ask. They are pretty competitive

Depends on what you want. Size and type affects price

They have a variety of different cost and sized gems. Generally, the smallest ones start at around a dollar, and go up from there

The prices vary depending on which stone and size. It's best to go in, if possible, and find the ones that best suits you.