Every website gives Sagittarius a different stone because they're all guessing from a Sun sign. This calculator doesn't guess. Birth date, time, place — it builds your natal chart, runs astrodynes on all planets including Jupiter's exact position and strength, maps aspects, checks stelliums and elemental balance, then outputs gem matches for each of your 12 houses. Plus a personal color and an ideal 3-gem set with chart-based force and harmony scores.