Feat: Crystal Healing
You know how to stimulate a body's natural healing abilities through the application of resonant crystals. Doing so requires you to use at least two semiprecious stones with a total value of 5 gp or more in place of healer's tools, which allows you to attempt to Treat Disease or Treat Poison using Occultism rather than Medicine.
If you're an expert in Occultism and you use gems whose total value equals or exceeds 50 gp, you gain a +1 item bonus to your Occultism check. If you're a master and the gems' value equals or exceeds 700 gp, the item bonus increases to +2; if you're legendary in Occultism and the gems' value equals or exceeds 15,000 gp, the item bonus increases to +3.