Gemstones carry different energetic frequencies which can help our bodies to heal themselves. Each stone's energies are unique to that stone and provide different benefits than another. They are beautiful as well as healing, and are a passive modality since you just have to wear them to receive the benefits (or place them within your energy field while sleeping). Don't be scared by the the word "gemstone" and assume they are prohibitively priced. There are therapeutic-grade gemstones available at every price point.
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Gemisphere -- This company really takes their therapeutic gemstones seriously. I believe they are truly the best. The wealth of information on their website will answer all your questions and you'll soon be compiling a wish list! I own several of their necklaces and recommend them highly. You can either look up gemstones individually to see their many benefits, or look up specific situations/conditions to see recommended gemstones for those purposes. Gemisphere's customer service is excellent and their representatives highly educated and experienced; they are very helpful and will answer all your questions. When you sign up for their e-mail, you will also receive a coupon for 10% off your first purchase. Additionally, you will receive information on their "Gem of the Week", which is discounted 20%; you can combine these offers for a really nice discount. Watch for inventory-wide sales in the summer and again in December, when they typically offer all gemstones at 20% off.
Gemisphere offers a lay-away program, which allows you to purchase gemstones when they're on sale and divide the purchase price into four payments; Gemisphere ships the item when the final payment is made. They also have a generous share program that you are enrolled in as soon as you purchase from them, so you can receive store credit for referring your friends.