Designing Kitchens and Bathrooms - tile-marble transition

I have a drop-in bath tub and a shower right next to it. The tub deck is tiled and the shower walls are faux marble panels. The glass shower door return is resting on the deck tiles. It so happened that the return frame is slightly offset on the tiles and from the inside of the shower you can see about 1 inch of tiles (6" bullnose) and their edges. I'd like not to have the tile edges showing inside the shower. I am thinking that it would be nice to find some sort of trim looking like "L", about 1X1 inch cross section (obviously, glazed on the outside of "L"), that I would put inside the shower on the edge of tiles and cover the transition tile-to-marble. The length is about 36": ideally it should be a single piece, but if not, maybe 2 or 3 pieces. Matching my marble color (caramel) would also be nice. Where can I find something like that? Or how do I search for it online? Thanks.

Can you post a picture so we see the colors, textures, etc?

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Thank you for the help. I contacted the marble company who made my shower panel: they make an outside corner trim. I'll go with that piece.
Best regards.