Tooth jewels made of inexpensive materials can cost about $20. But higher gems usually start around $50, and the price can go way up depending on the type of jewelry you use. For example, a 24k solid gold tooth gem, with a stone, starts at about $100. A genuine diamond or ruby will also cost more than a cubic zirconia stone. You can find lots of high-quality tooth piercing jewelry online. You might also find some options at piercing salons or jewelry stores.