Hessonite Garnet is the gemstone of Rahu. Every other lagna needs the chart read first — the stone amplifies the graha either way.
Also known as: Gomed · Gomedh · Gomedak
A planetary gem is held to absorb and transmit the radiation of its graha, which is why it is the strongest intervention in the classical set — and the only one that can make things worse. It amplifies whatever the planet is already doing in your chart, so it is prescribed against a reading, never against a wish.
Hessonite is Rahu’s stone, and the corpus withholds it from most charts — it is prescribed narrowly, for a specific purpose, or not at all.
Hessonite is Rahu’s stone, prescribed for the confusion, anxiety and scattered ambition an afflicted Rahu produces.
The classical record gives no per-lagna verdict for this stone, because most charts are not meant to wear it at all. It is prescribed narrowly — a strong dispositor, an upachaya placement, and a specific purpose — or not prescribed. Mantra and charity are the remedies for this graha.
Most charts do not benefit from a Rahu gem at all. The corpus is unambiguous: wear it only when Rahu’s dispositor is strong, when Rahu sits in an upachaya house, and when a qualified astrologer has prescribed it for a specific purpose. Mantra and charity are the safer remedies here.
Orange Zircon · Spessartite Garnet
Most charts should not wear Hessonite Garnet at all. It is prescribed only where the node's dispositor is strong, where it sits in an upachaya house, and for a specific purpose named by a qualified astrologer.
The accepted substitutes are Orange Zircon, Spessartite Garnet. They carry the same caution as the primary stone: the substitute is cheaper, but it is the graha and not the price that decides whether it should be worn.
The mantra, the weekday fast and the charity are safe for anyone — they address Rahu without amplifying it. Hessonite Garnet is not: a planetary gem strengthens whatever the graha is already doing, so it needs a chart reading first.