Ah, an ancestral home in Ilocos Sur! Stayed in Vigan once, just to study the town layout & buildings.
Flagstone or Chinese granite that had been used as galleon ballast was probably the original flooring before your ancestor changed it to Machuca tiles, especially if you're referring to the ground floor's former carriage house.
Btw, Machuca will let you change the color combination of a tile at no added cost, so if you want to save your original stock, it probably can be done.
Don't even ask how much piedra china is these days-- too ridiculous.
Good luck to you--