Gemologist (5e Feat)

You have extensive knowledge of precious gems. You gain the following benefits:

Increase your Intelligence score by 1, to a maximum of 20.
You gain proficiency with jeweler's tools.
When you use the Crafting downtime activity to cut a gemstone from its raw form into a jewel, you progress at a rate of 50 gp-per day (instead of 5 gp).
When you make a Charisma (Persuasion) check when buying or selling gems, you are considered proficient in Persuasion and add double your proficiency bonus (instead of your normal proficiency bonus).