Yellow sapphire is considered the gentlest of the powerful Vedic stones, and is recommended more often than others without fear.
However, the enhancement works both ways. If Jupiter rules difficult areas of life in the chart, excesses also increase along with growth: overconfidence, expansion beyond one's means, and a tendency to promise more than one can deliver.
Traditionally, yellow sapphire is not combined with diamond, blue sapphire, and hessonite.