Gemstone Selection Is Not One-Size-Fits-All
Gemstones are traditionally associated with planets, but that does not mean the same gemstone is suitable for everyone. The planet associated with a stone must first be examined in the individual horoscope.
The Ascendant
The Lagna establishes the house framework and helps determine the functional role of the planets. This is one reason gemstone selection should not be based solely on a generic zodiac-sign list.
Planetary Lordship
A gemstone is traditionally understood as strengthening the planet associated with it. Therefore, before recommending a gemstone, the astrologer should consider what that planet rules in the individual chart.
Planetary Strength
Sign placement, house position, dignity, aspects, conjunctions and other factors contribute to the assessment of planetary strength.
Dasha and Timing
Planetary periods can provide additional context. If a particular planet is active through Mahadasha or Antardasha, its role may deserve closer examination.
Why Rashi Alone Is Not Enough
Choosing a gemstone solely according to Moon Sign or Sun Sign can overlook important information in the complete horoscope.
Gemstone Quality
Traditional gemstone practice may also consider natural characteristics, clarity, treatment and authenticity. A gemstone recommendation therefore has both an astrological and practical dimension.
Conclusion
A responsible gemstone recommendation should emerge from a structured horoscope analysis rather than a generic list of stones for zodiac signs.