Love the armless sofa-bench! Try using it in the center as a "cross-linking" piece between the sofa and chairs. That way people can sit on both sides of it, conversing with the sofa people and the chair people. Put the chairs where it is and use the side table from the left of the pic, or the one with flowers, between them. You'll need one huge rug to anchor the space or two smaller, and very similar ones, to put on either side of the blue sofa-bench. The other two side tables are too tall and too short for your seating pieces, so ditch them. Use your coffee table between the sofa and armless sofa (18" away from each of them.) Here's a chart for judging table and lamp heights as you'll need to work on that for balance. Please try this arrangement, and post by commenting and using the Attach Images button to add pix of the update. We'll tweak it on out from there.

I'm curious as to why you are choosing a black mosaic without having a plan for the rest of the space, or have you moved into a space with an existing black floor? I think it would be hard to keep clean, since with mosaics there is a lot of grout. For a jewellery store, it's important the goods for sale are presented in an elegant way. You really must consult an interior designer to put a plan together for you which will also include a lighting plan to highlight everything.

Your walls could be alost any color as for the furniture I would look into the tapestry and when that is decided choose a color from it for the walls

Consider Grey or white. U could also use geometric or any pattern in mint green