On average, the effect of natural yellow sapphire lasts for 3-4 years. However, the working age may vary as per the gemstone quality. A higher quality, natural, and properly cut yellow sapphire can transmit better energy than the flawed or treated ones. Even astrologically the compatibility of your horoscope with the Planet Jupiter and the law of cause and effect(karma) decides the potential working of the Guru Gemstone. Some people also believe that the working of pukhraj ratna is the strongest within the first year of continuous wear. Even your efforts adds to the effectiveness. So create a powerful synergy by setting realistic goals, making wise decisions, and taking action.