My astrologer has given me a rakhtmukhi neelum which is purple bluish in shade, it changes shades and sometime?

s appeares red, sometimes purple or blue. Alonwith it i am suggested a yellow sapphire. I am wearing the rakhtmukhi neelum since 15th march and have found good results in terms of mental and physical aspects(reduced negetivity and increase of positive energy). Should i continue wearing the same?? my dob is 29.05.1979, time 8:00 am, Place Indore.