If you have already reached level 36 in the game, you may see the message "First talk to Eva" on the jewelry workshop and the message "First fix the jewelry workshop" on the pond with pearls in buildings section of the store on your home island.

The thing is, that these items become available after completing Pearl Island story. The dialogue with Eva (mother of the family) will appear then as well. Don't worry, if you have not opened Pearl Island yet, then you just need to keep completing the active quests and you will get there later.

Here's an article about the conditions for opening of the new islands in the game, you can also check it.