Although it looks like tile, this is actually stamped concrete
with an integrated color. The contractor then grouted the
expansion joints to further the illusion that tile was used
to create these stairs. Real Mexican tile was added
to the face of the stairs to complete the look.
These stairs were built by Nature Designs Landscaping
and here is their webpage;
Photo by Doug Kalal, taken at a client's house in Rancho Bernardo