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 the buildings section of the store on your Home Island.
Bear in mind that these items become available after you have completed the 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 new islands in the game. Check it out!