Pushparaga or yellow sapphire is a lesser known gem in today's market.  Known as "Oriental topaz" until the mid-1800's  Colors vary from light yellow to golden and honey yellow. They have considerable lustre, come in a variety of cuts and are increasing in market value.
Pushparaga or yellow sapphire harmonizes and benefits Guru or Jupiter, the largest graha (planet) in the solar system.  It signifies knowledge, wisdom, virtue, fortune, justice, education, future, religion, philosophy, devotion, children, distant travel, spirituality, truthfulness, prosperity and charity.  Guru is the major instructor or teacher and influences action with the highest order and balance.  Guru guides action in the most harmonious and uplifting manner and balances inner and outer input while simultaneously performing and monitoring action. Guru or jupiter's influence in the human physiology is through the globus pallidus.  This globular structure is like a teacher in the physiology.  It gives balanced and higher-order instructions, balances and maintains harmony between inner and outer input, manages and executes complex systems and enlivens activity in the brain while guiding action.  It signifies highest-order thinking -- Knowledge has organizing power.