Let's know what is the impact to wear Ratna in our life. Certainly an appropriate Ratna if you wear at appropriate time with vidhi-vidhan gives u certainly a beneficial result.

According to Indian jyotish Grahas are nine. Surya, Chander, Mangal, Budh, Guru, Shukra, Shani and Rahu Ketu both as chaya graha.
A human body contains 70 percent of water and rest minerals, metals etc.
Like Sodium, Potassium, Calcium, Phosphorus, Zinc, Copper, Iron,Gold, Chromium, Cobalt etc.
If our body lacks anything of these we get different disease. 
Like if Iron get lesser we get Anemia, if we get lesser Iodine we get Thiorid disease. Lesser calcium in body generates weaker bones. And we get lesser Sodium our body gets B.P. disease. Sugar disease is due to increased level of Carbohydrates in our body. To cure these disease we take medicine to fulfill these minerals in our body.
On Earth all Ratnas are made by God contain different minerals.
Like pearl is made of Calcium carbonate.
Sapphire and Ruby is having Aluminium oxide.
Emrald is having Chromium.
Diamond is made of Carbon.
Gomedh silicate and Cats eye Berrium etc.

A learned astrologer can judge according to your Grahas that in a correct dasha by wearing a correct stone can remove your bad effect of Grahas.