Practical Lithomancy

 You have studied the art of reading signs and divining omens from the magic trapped in stones. You gain the following benefits:

• You gain proficiency with the Gemologist's Supplies. If you are already proficient with them, you add double your proficiency bonus to checks you make with them.
• You have advantage on all Wisdom-based skill checks while you possess a crystal or gemstone.
• As part of a short or long rest, you can enchant a crystal or gemstone with magic runes that allow you to cast the augury spell as a ritual. When you cast the spell in this way, the magic runes burn an image of your omen into the crystal or gemstone itself. When you make a skill check to interpret this image, you can add your Wisdom modifier to the roll.