The prestige of the pieces of glass comes from The Farm Philip V granted the actual manufacturing conditions to this Factory. Since then it has maintained the quality of raw materials and the careful preparation of craft production.

The handcrafted glass has a number of manufacturing characteristics that give the piece a special uniqueness, giving it ownership of Pièce Unique. Each piece is not part of a series, has been performed manually by a master craftsman, using a historical mold and following the same techniques as their predecessors in the Royal Glass Factory of La Granja. The finishing of the pieces are handmade, some irregularity which may occur due to manual work done. This should not be considered in any case a defect, but a unique and exclusive of each of the parts.