Any recommendations on buying in Tokyo?

Hi, all! I will be going to Tokyo for my honeymoon in a few weeks, and I’m looking to purchase a ring and a bracelet. I’m not seeing any reservation options for any of the stores, so I’m wondering:

- What is the walk-in process like?

- If purchases are tax-free (or would we need to file for a refund at a later time and what that process looks like)

- Would I need to bring anything besides my passport and a card?

- Are there any sales associates you’d recommend?

Thank you in advance for your help!