Should Christians Actually Use Crystals & Stones for Energetic Healing?

Crystals and Gemstones are tremendously present in holy scriptures because of the simple fact that ancients use them to declare their values, purposes, and wisdom. The mentioned stones are several, here're the passages that show the most popular ones:

Amethyst is the twelfth and last stone of the foundation of the New Jerusalem. It is the third stone in the third row of the rational, representing the tribe of Issachar (Ex., xxviii, 19; xxxix, 12); the Septuagint enumerates it among the riches of the King of Tyre (Ezech., xxviii, 13). 

Topaz is the second stone of the rational (Ex., xxviii, 17; xxxix, 19), representing Simeon; also the second stone in Ezech., xxviii, 13; the ninth foundation stone of the celestial Jerusalem (Apoc., xxi, 20) and also mentioned in Job, xxviii, 19.

Carnelian is the first stone of the breastplate (Ex., xxviii, 17; xxxix, 10) representing Ruben. It's also the first among the stones of the King of Tyre (Ezech., xxviii, 13); the sixth foundation stone of the celestial city (Apoc., xxi, 19). Also found in Noah's story.

Diamond, (Ezech., iii, 9; Zach., vii, 12; Jer, xvii 1). In the last citation, Jeremiah informs us of a diamond usage "The sin of Juda is written with a pen of iron, with the point of a diamond". 

Emerald (Ex., xxviii, 17; xxxix, 10), representing the tribe of Levi; it is the ninth stone in Ezech., xxviii,13, and the fourth foundation stone of the celestial Jerusalem (Apoc., xxi, 19). The same stone is also mentioned in Tob., xiii, 16 (Vulg. 21); Jud., x, 21 (Vulg. 19); and in the Greek text of Ecclus., xxxii, 8, but there is no indication of it in the Manuscript B. of the Hebrew text, found in the Genizah of Cairo in 1896.

Sapphire (Ex., xxviii, 19; xxxix, 13), it represented the tribe of Issachar. It is the seventh stone in Ezech.; it is also the second foundation stone of the celestial Jerusalem (Apoc., xxi, 19).

Gemstones are also present in a beautiful passage about Aaron's Breastplate:

“Then, with great skill and care, make a chest piece to be worn for seeking a decision from God.
Make it to match the ephod, using finely woven linen embroidered with gold and with blue, purple, and scarlet thread.
Make the chest piece of a single piece of cloth folded to form a pouch nine inches square. 

Mount four rows of gemstones on it. The first row will contain a red carnelian, a peridot, and an emerald.
The second row will contain a turquoise, a blue lapis lazuli, and a white moonstone. The third row will contain an orange jacinth, an agate, and a purple amethyst.
The fourth row will contain a blue-green beryl, an onyx, and a green jasper.
All these stones will be set in gold filigree. Each stone will represent one of the twelve sons of Israel, and the name of that tribe will be engraved on it like a seal."

It was made according to the design given by God to Moses. This breastplate was important because it was how God revealed His plan to His people.