Short answer: NO.
And if you are really and truly working for a jewelry store than you need to tell them *NOW* that you do not understand databases and that you are *NOT* the person for the job. Tell them you will help them find somebody who can do the work, because you can't.
On the assumption that your tale about working for a jewelry store is just a cover for the fact that this is homework for some class: I think you need to go study your database design book(s) a lot more. First of all, there is no possible reason to have more than one DATABASE. Period. More than one table? Yes. But even then not the tables you are proposing.
You need to go look in your books for the proper setup of a classic inventory/customers/order/orderitems/vendors/purchases/purchaseitems system. That's 7 tables, if you are counting. Possibly some more, depending on what else your homework assignment is asking for, but clearly starting with 7.
An optimist sees the glass as half full.
A pessimist sees the glass as half empty.
A realist drinks it no matter how much there is.