What are the generally prescribed gemstones according to Rashi or Lagna lord. For Lagna lord, you need to find your horoscope and see which Rashi is in your Lagna or the Ascendant from the below description of Zodiac. No detailed calculations are done.
Aries/Mesha and Scorpio/ Brishik: Coral (Muga)
It should be at least 3 carats in size, set in white gold or silver and worn on the index or ring finger of the right hand and worn on Tuesday or at the chosen muhurta.
Taurus/Brish and Libra/Tula: Diamond(Hira)
It should be at least one carats or weight divided by 10 in size, set in white gold or White gold and worn on the middle or ring finger of the right hand. And wear on Friday or at the chosen muhurta. Substitutes are a white sapphire, clear Zircon or quartz crystal.
Gemini/Mithun and Virgo/Kanya : Emerland (Panna)
It should be at least 1 carats in size, set in white gold worn on the middle or ring finger of the right hand and worn on Wednesday or at the chosen muhurta.
Cancer/Karkat: Pearl (Moti)
It should be at least 2 carats in size, set in white gold or silver and worn on the ring finger of the right hand. And wear on Monday when the moon is waxing, in Taurus, Cancer, Pisces or in friendly sign or at the chosen muhurta.
Leo/Simha: Ruby
It should be at least 2 carats in size, set in white gold and worn on the ring finger of the right hand. And wear on Sunday, preferably on the rising sun or at its own sign or in friendly sign or at the chosen muhurta.
Sagittarius/Dhanu and Pisces/ Meena: Yellow Sapphire (Pushparaj or Pukraaj)
It should be at least 3 carats in size, set in white gold or silver and worn on the index finger of the right hand. And wear on Thursday, preferably when the moon is waxing or at its own sign or in friendly sign or at the chosen muhurta. You might want to know about Jupiter effect in 2018 here.
Capricorn/Makar and Aquarius/Kumbha: Blue Sapphire (Neelam)
It should be at least 2 carats in size, set in gold and worn on the middle finger. Starting from Saturday when it is in own house aspected by Jupiter or with additional gem for a friendly benefic planet like Venus, Jupiter or Mercury
