Botsuraku Reijou no Okinimesumama: Konyaku Haki Sareta node Houseki Kanteishi to Shite Dokuritsu Shimasu

Audrey, a noblewoman in name only, works at a shady magic jewelry store, leading a dull life. Born without the magical powers needed to appraise magic jewels, she is unable to achieve her dream of becoming an appraiser and is treated at the bottom of the workplace. On top of that, her engagement to the chairman of the trading company is broken off, hitting rock bottom... One day, just as Audrey is at her wit's end, the spirit of a crystal called quartz appears before her...?! Now that she has made a magical contract with the spirit, Audrey's life is about to change. She's an expert at appraising magic jewels and using incredibly powerful spirit magic! She's thriving in her dream job! The free and wonderful independent life of magic jewelry appraiser Audrey begins!

(Source: Manga UP!, translated)