Jyotish is Indian astrology, and it is a sister science to Ayurveda.  Jyotish recommends certain gemstones, because of their energetic properties, to help balance the doshas.  Here are some examples.

For Vata: Ruby (or Garnet), Yellow Sapphire (or Topaz), and Emerald (or Aquamarine).  Metal: gold.
For Pitta: Pearl (or Opal), Lapis Lazuli, Emerald (or Aquamarine). Metal: silver.
For Kapha: Ruby (or Garnet), Cat’s-Eye, Blue Sapphire.  Metal: copper.