Yes this is one of our favorite tiles to work with, 18x18 Walnut Travertine. All Natural.  Travertine can be used in custom applications that man made ceramic and porcelains cannot be used.  The Niche actually has an Ogee profiled edge.
Custom Designed Floor with pinwheel accents
Custom Niche & Seat
 

Custom Made Shelf with Profiled Edge

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