Amber Dealer
In this Zelda: Tears of the Kingdom side quest guide, we'll give you the complete solution for the Amber Dealer side quest.
At the entrance to Goron City, you'll meet 2 characters. They will try to sell you three Red Rupees a piece, and just as you refuse or accept their offer, Ramella will suddenly appear in front of you to prevent you from being ripped off.
She offers to buy 10 Ambers for the price of 200 Rupees. This will triggers the Amber Dealer side quest. To complete the mission, simply give her 10 Ambers in exchange for 200 Rupees. This completes the mission: Amber Dealer.
We recommend that you sell your gems to Ramella, as she offers a better price than other places that buy your gems. It's a great way to get Rupees fast. The next thing she'll buy from you is Topaz for 1,000 Rupees.