Gemstones - A Quick Reference Guide (Ratna Guide)

Here is a quick reference guide to gemstones. You can also refer this post to know the procedure to wear a gemstone.

Planet	Gemstone	Nature of Gem	Finger in which to be worn	Day on which to wear	Preferred Metal	Weight	Substitute
Sun	Ruby	Hot	Ring Finger	Sunday	Gold	3 or 5 rattis	Corundum, Red Garnet
Moon	Pearl	Cold	Pink or Ring finger	Monday	Silver	2, 4, 6 or 9 rattis	Moon stone
Jupiter	Yellow Sapphire	Cold	Ring finger	Thursday	Gold	7 or 13 rattis	Citrine, Yellow Garnet
Rahu	Hessonite	Cold	Middle or pink finger	Saturday	Silver	6, 11 or 13 rattis	Brown Tourmaline
Mercury	Emerald	Cold	Middle or pink finger	Wednesday	Gold	3, 5, 7 or 10 rattis	Aquamarine, Green Tourmaline
Venus	Diamond	Hot	Ring finger	Friday	Gold or Platinum	¼ or ½ ratti	Zircon, White Coral, Quartz
Ketu	Cat’s Eye	Very Hot	Middle or Ring finger	Tuesday	Gold	3, 5 or 7 ratti	Tiger’s eye, Agate
Saturn	Blue Sapphire	Very Cold	Middle or Pink finger	Saturday	Gold	5 or 7 ratti	Amethyst, Lapis Lazuli
Mars	Red Coral	Hot	Ring or Middle finger	Tuesday	Silver or Copper	7, 9 or 11 ratti	Corundum