I have had mixed results w/ Ayurvedic medicine. Using Ayurvedic toothpaste has gotten my teeth and gums to be healthier than they ever were when using conventional brands of toothpaste; using oil before showers occasionally has really helped my skin. The recommended foods hasn't worked great for me -- but I think that is due to me seeming to switch doshas fairly often. However, I know others who always have great results.
Uses of Gems:

For healing: Amethyst, Bloodstone, Pearl
(I find Pearl draining unless used with other stones. I would not use it for physical healing unless you have an over abundance of energy. I would use it for emotional healing)

To experience subtle effects of energy: Diamond, Lapis Lazuli, Ruby

To attract creativity: Bloodstone, Pearl

For receptivity: Agate, Beryl
(I use Citrine or Cape Amethyst)

To provide general protection: a Beryl, Lapis Linquis

(I use Sodalite or Mother of Pearl)

For protection against cold: Carbon Steel
(I haven't used this. I would instead try Rose Quartz.)

For protection against anger: Pearl, Opal
 

Ayurvedic Birthstone chart