hi!
I was watching Japanese romamce drama a few months ago, it was definitely released after 2010 and the production seemed really high quality.
I think I only watched the first episode but this is what I remember happening:
FL & ML both work in an office for a jewellery company, they also visited a store where the FL showed the ML around and stuff since he was new to the company.
The first time they met they bumped into each other and the FL lost a ring her boyfriend proposed to her with (she decided to look for it so she could give it back to her bf and reject his proposal). The ML&FL both looked for the ring and eventually find it before going seperate ways (I think the FL had a meeting she was running late for).
Then they meet when the ML is hired as her boss/superior at the company. I also remember that the FL had long hair and lived with two of her girl friends, one of which worked as an editor/something similar + had a work party that the FL & ML both attended.
I'm less sure about this part but I think the FL forgot her journal and the ML picks it up and reads it. Then he sees how jewellery is an important part of her life/she uses it to immortalise important events.