The name of this gemstone comes from the Spanish pieda de ijada, "hip stone"; it was thought to cure kidney diseases
... that 
the Spaniards named the mineral "piedra de la ijada", ie the hip stone, because 
it... [DOC] [TLE] Jade vs. Serpentine - Cochise College P [PAR] The word jade actually comes from the Spanish Piedra de ijada which means 
hip-stone because it was thought to be a protector against kidneys disease and 
even a cure for it.