Gemstone
Ruby
The ruby is the Sun's stone: worn to support vitality, confidence, and standing
The ruby is the Sun's stone: worn to support vitality, confidence, and standing. In this tradition a gemstone strengthens its planet, so it suits charts where the Sun's help is wanted.
The ratna tradition assigns manikya to Surya among the navaratna, worn in gold on the ring finger, set on a Sunday in the Sun's hora.
— Phaladeepika ratna tradition
On this platform gemstones are engine-recommended only: the recommender weighs the 9th, 5th and 1st lords (yogakaraka override, trik exclusions, Shadbala comparison) and relays exactly one most-favoured stone with evidence IDs. A ruby appears in a report only when Surya is that computed candidate — the model never originates a stone.