The Bag of the Gemwright is a small item created by Gemwrights (an Artificer sub-class) which weighs 5 pounds, regardless of its contents.
While the bag is on your person, you can use it to retrieve jeweller's tools as well as a certain amount of ethereal gems from the Astral plane based on your level. It can also be used as your spellcasting focus. You can also choose to store up to 10 non-ethereal gems in the bag also. If anyone other than you tries to use the bag, it will be empty to them.
If you lose your bag, you can perform one hour of tinkering to create a replacement. This can be done during a short or long rest, and it destroys the previous bag. The bag is also destroyed if you die and any non-ethereal gems are are sent to the Astral plane in the spot where the bag was destroyed.
Notes: Utility, Container, Artificer