When Jupiter is functional beneficial planet in your horoscope and well placed in Kendra or trines you can wear yellow sapphire to enhance the positive effects of Jupiter and get beneficial results. But its not necessary to be placed in Kendra or trines for Jupiter as some times functional beneficial planets are not strong enough to give results in their time periods due to placement other then Kendra or trines.
In that case astrologers can suggest to wear yellow sapphire to enhance the strength of the planet according to their situation. When planet like Jupiter is functional malefic lord of 6th, 8th or 12th houses, still yellow sapphire can be worn according to the current need of person.
For example 6th house of horoscope is stands for job and service and when person need a job and not able to find a good job, in that case 6th house can be strengthen by wearing its lords gemstone. So its never said that only functional beneficial planets gemstone has to be worn all the time. The best way to chose right gemstone for the right reason you need to consult an experienced astrologer.
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Astrologer Sunil Kumar