Gemstones for Marriage Follow the 7th Lord

Mesha and Vrishchika: Venus, diamond. Vrishabha and Tula: Mars, red coral. Mithuna and Kanya: Jupiter, yellow sapphire. Karka: Saturn, blue sapphire. Simha: Saturn again, blue sapphire, because the 7th is Kumbha. Dhanu: Mercury, emerald. Makara: the Moon, pearl. Kumbha: the Sun, ruby. Meena: Mercury, emerald. That table is lordship, not a promise. Blue sapphire for a Karka 7th lord also rules the 8th, because Saturn rules Kumbha and Makara, the 7th and the 8th. Feeding the marriage lord then feeds rupture. The table tells you the candidate. The second lordship tells you whether to refuse it.

You can attend to Venus even when Venus is not the 7th lord, because the karaka of marriage is still Venus. Diamond then feeds Venus's houses, whatever they are. For Kanya lagna Venus rules the 2nd and the 9th, a wealth and fortune pair, so diamond is not a dusthana feed. For Karka, Venus rules the 4th and the 11th. For Simha, Venus rules the 3rd and the 10th. None of those is the 7th. A couple who both wear diamond because 'marriage is Venus' may be feeding two different sets of houses. Read each lagna. Navamsa shows whether Venus and the 7th lord gain dignity in D9. A fallen 7th lord in rashi and in D9 is a poor candidate for a stone that makes it louder.

Mars in a Manglik house is not automatically a reason to wear coral, and it is not a reason for the spouse to wear coral. Coral strengthens Mars. If Mars is the 7th lord, the table above already includes it, with the dusthana warning. If Mars is merely sitting in the 7th and ruling something else, coral turns that Mars up. Tuesday is Mars's day if a non-gem observance is wanted. It still does not extract Mars from the house. The marriage reading remains the 7th lord, Venus, and D9, in the dasha that is running.