Yes — the stone categories you work in are not locked in; you can update your selection later under Settings › Company › Company Profile.
That screen opens straight in edit mode. In the category section, click a category (marble, travertine, granite, onyx, limestone and so on) to add it to your list; clicking a selected badge again removes it. Then hit Save changes at the bottom of the page and check that your profile shows the updated list.
Your categories are not cosmetic — they decide what you see in the market. On the supplier side, the Marketplace screen shows published demands in your category. Add a category and demands opened in it start reaching your feed; drop one and its demands stop being listed. On top of that you can filter the Marketplace by category and keep that filter with Create alarm for this search, which saves you rebuilding it each visit (an alarm stores the search; it does not notify you).
On the buyer side, the same selection tells suppliers which stone types you source, and it is visible on your profile — widen your scope and more qualified suppliers match with you.
Also asked as: Can I add or remove categories? · I want to update my stone categories · How do I add a new stone type? · How do I change the categories on my profile?