You can choice your size, we include the emeral like says in the Cyprian book
 
Great Protection
 
Prayer:
San Cipriano Prayer "Dedicos Señor Poderoso Alfa y Omega. Substance and spirit of all creation, the memory of my soul, waiting for your divine protection, in how many works to perform on this day " It should be used on the index finger of the right hand It is placed on the stone man in the morning and the Prayer is said Protect from all treachery and all harm and gives you a wisdom equal to that of King Solomon and gives you a clear intelligence.
 
 
The 7 metals are those that represent the power of the 7 main planets
 
WHY IS THIS TALISMAN POWERFUL? Because of the symbology that it contains, because it is prepared and ritualized with decrees and rituals of high magic that help it increase its power of protection. It is also made in alloy of 7 metals that correspond to the 7 alchemical planets.
 
The Seven Planetary Metals
Gold represented as the Sun ☉ ☼ ()
Silver represented as the Moon ☽ ()
Copper represented as Venus ♀ (or also:)
Iron represented as Mars ♂ ()
Tin represented as Jupiter ♃ ()
Mercury represented as Mercury ☿ ()
Lead represented as Saturn ♄ ()