"Artecer" is the most prestigious of the manufacturers of these Seville ceramic plates. These plates are enamelled with 24-karat gold. It is known as the work of "dry rope", which was brought by the Arabs in the 8th century to Andalusia. Since then this craftsmanship has been carried out in Spain.
You may have noticed two different styles. One is purely geometric, which is the original style. This style has more work and also more gold, therefore logically it is more expensive.