Tula rashi
Among the sixteen adornments, silver and platinum traditionally appear in nath, karn phool, payal and bichua. That is a statement about materials and custom — silver below the waist, gold above it, stones set according to family tradition — rather than about what anyone ought to wear.
The chain from rashi to ruling graha to navaratna stone is classical and stable across texts. What does not follow from it is a recommendation. In actual practice, a Jyotishi choosing a gemstone looks at your lagna and whether the planet is a functional benefic for it, the planet’s dignity and house, and the dasha you are running. Two people with Libra rashi and different ascendants can reasonably be advised in opposite directions.
Gemstones are also the most common vehicle for fear-selling in this industry: a reading names a problem, and the remedy has a price. We don't sell stones and we don't recommend them. If a consultation ends with an invoice for one, that is worth noticing.
Venus also rules Taurus, so the same stone and metals apply there.
All twelve rashis · The sixteen adornments · Find your rashi