The cemetery custodian explained to me that in the 50s to 70s it was common for folks to choose to make their own cement marker and stamps were used to indent the letters. This gravesite is obviously visited by family for somebody painted the letters with blue paint. Otherwise the words would have been pretty much unreadable.
My opinion: I think it's comforting and economical to make your own (or a loved one's) tombstone. But I also think they rarely last as long as commercial ones. This opinion is re-enforced by walking cemeteries and looking at the ones which have weathered unreadable. I recognize that some knowingly chose this option. But I fear that for too many it just happens.
My point is this: Decide how long you want the marker to be readable and choose accordingly.
Tika knows that she will rest in the pet resting place on our own property marked with a large black basalt rock. Tiz fitting for her.