Gemstones which have colors and properties related to planets are used to enhance power of a weak benefic planet in horoscope.
It should not be used for a planet if its functional malefic or placed in 6,8,12 houses.
If a planet is benefic to native by its ownership of good houses but if it is combust or conjunct rahu-ketu, then its power gets reduced and it wont help the native as much required.
So to enhance its power, a gemstone related to it or colored clothes related to it are used.
When a person cannot find quality gemstone or cannot afford it, then alternate gemstones can be used, which usually give lesser effect than original but are safe to use.
| Gemstone | Planet | Minimum Weight | Metal | Finger | Day | Time | Alternate Gemstone |
| RUBY | SUN | 3 Carat | GOLD | RING | SUN | MORNING | Garnet |
| PEARL | MON | 3 Carat | SILVER | LITTLE | MON | MORNING | Moonstone |
| CORAL | MAR | 6 Carat | SILVER | RING | MAR | MORNING | Cornelian |
| EMERALD | MER | 4 Carat | GOLD | LITTLE | MER | MORNING | Aquamarine, Peridot, Jade |
| YELLOW SAPPHIRE | JUP | 4 Carat | GOLD | FIRST | JUP | MORNING | Yellow Topaz |
| DIAMOND | VEN | 1/4 Carat | PLATINUM | LITTLE | VEN | MORNING | Tourmaline |
| BLUE SAPPHIRE | SAT | 4 Carat | 5-METAL | MIDDLE | SAT | EVENING | Amethyst, Lapis Lazuli |
| GOMED or Hessonite | RAH | 5 Carat | 8-METAL | MIDDLE | SAT | NIGHT | None |
| CAT’S EYE | KET | 6 Carat | SILVER | RING | JUP | NIGHT | None |