Thank you for posting here! I will provide some explanation here on how subcategory works on Luulla.
The name of the subcategories are located at the sidebar whenever you clicked on a category page.
For the jewelry category, you can see the name of the subcategories using the following link:
Currently, the subcategories for jewelry are: Necklace, Earrings, Pendant, Bracelet, Ring, Brooch, Copper Jewelry .
To make sure that your item appears in the correct subcategory, go to edit product and include the correct tag under the product tags and click save.
For example, once you included the tag Earrings in your product item, your item should appear in the following subcategory page.
Hope this explanation helps! Wishing you a wonderful day!!