"For a believer no proof is required. For a disbeliever, no proof is enough"
See the scanned pages of KSK's own words on gems and how KP system astrology can select gems through its own methods from Astrology and Athrishta November 1969 issue page 3 - 6.
Still some people will try to misguide you by saying that in KP system, no gems are used. This is what happens in Kaliyuga when a fool tries to lead the educated people. They will constantly misquote and misrepresent the 'fate-destiny' argument from KSK's write-up without being trained in astrology and without having a proper guru.
In my new Gem video course (See here), I have discussed the difference between Fate and Destiny. Difference between Bhobitavya and Purushakar and how these interact in a horoscope. These are based on simple tantric philosophies of astrology. Thousands of years and millions of people cannot be fools who have worn gems and led a better life.
One should not be like a horse with blinkers, refusing to see the wider world because some 12th pass high school drop-out misguides them.
You have two choices:
1) Believe the foolish people and deprive yourself from the bigger knowledge and wait till your next birth.
2) Get the bigger knowledge in this birth. The knowledge which will remain in your Annamay Kosha of your soul and travel with your soul in your next birth.