Jeweler

Jewelers buy and sell jewelry, precious metals, and gemstones.

Gemstones and jewelry count as "treasure" and can be sold to merchants for their full value.

Downtime Activity: Training
You can spend time with an instructor to gain proficiency with jeweler's tools, smith's tools, glassblower's tools.

Resources. Receiving training in a language or tool typically takes at least ten workweeks (50 days), but this time is reduced by a number of workweeks equal to your Intelligence modifier. A negative Intelligence modifier doesn't increase the time required for training. In addition you need to find a teacher and pay 25 gp per workweek.

Resolution. At the end of your training, you gain that new tool proficiency.