Jewel

Jewels (宝石), also known as gemstones, gems and precious stones, are pieces of mineral crystal and certain other substances, which are cut and polished to use in and other adornments, being valued by humans because of their properties.

Various pieces of folklore and superstition involve specific jewels or types of jewels, and as such, they play a role in certain forms of magic. Certain jewels also have properties which are utilized in technological applications.

Principles
There are various classifications and types of jewel or gemstone, according to their qualities and properties. Most are mineral crystals, though there are certain non-mineral rocks and organic materials which are considered gemstones. The five of antiquity are  (white),  (red),  (green),  (blue) and  (purple). Others include, , , , , , and.

 are gems which are assigned to each of the twelve months (e.g. turquoise or lapis lazuli for December), along with the respective periods of birth and Zodiac signs. There are several different versions of the birthstone list, with the most well-known one at present being one created by the American National Association of Jewelers.

One belief concerning jewels is that they can gather up the power of constellations and return it to the wearer. The harder the stone, the more power it is said to absorb, with diamond at the extreme. As such, it thought that jewels can be used for many specific goals besides vaguely providing good fortune, such as detoxing, exorcisms, and .

There are a number of stories involving jewels which are considered to have fallen into the "cracks". One is that of a cursed jewel said to bring misfortune and death to its owners. Another is that of a pair of a sword and a jewel that heals wounds caused by it.

Jewels can be produced through artificial means. The analogy of the difference between a natural gemstone and an artificial one has been used to distinguish espers artificially created through the Power Curriculum Program and espers who have arisen in the natural world, the latter being referred to as Gemstones.

Diamond
Having the highest hardness of any natural material, diamonds are used for industrial applications such as polishing and cutting, being used for cutting purposes as both a solid tool tip and in the form of diamond dust.

Artificial diamonds have been produced both for various uses, including decoration and industrial applications. One practice is the creation of s, created by compressing the carbon in the ashes left behind after a person is cremated.

A supposed liquid diamond has been created in Academy City (theoretically impossible as diamonds have no melting point, and valuable as a result), though it is actually a condensation of precious metals dissolved in sea water, including gold, platinum, rare earth and carbon. The Dianoid has been described as being made out of diamonds, but it is technically made out of carbon materials, though a number of artificial diamonds are included.

Ruby
Rubies, sapphires and oriental emeralds are largely composed of the mineral, the crystalline form of aluminium oxide.

Ruby red is associated with the rose of the Rosicrucian Order, with the influenced Second Order of the Golden Dawn also being named the R.R.etA.C. (short for "Rosae Rubeae et Aureae Crucis", meaning "Ruby Rose and Golden Cross"), and there are many rubies among the Rosicrucian treasures hidden around the world.

The brightest and most valuable shade of red in a ruby is known as blood-red or pigeon blood (ピジョン・ブラッド), rubies for which include (Cr). Coronzon has made use of three pigeon blood rubies to symbolize the blood of three which was used to draw the magic circle for summoning it and act as a medium to exert its influence.

Magic God Invasion Arc
A series of events which occurred during the High Priest's rampage through Academy City involved a supposed liquid diamond, with Akikawa Mie, daughter of a couple involved in the liquid diamond project, attempting to keep it safe from theft after its vault was damaged.

Processor Suit Arc
While inspecting her new body, Aleister Crowley mentioned how  could lead to a ruby, sapphire or oriental emerald. While possessed by Coronzon, whose control was rooted in three pigeon blood rubies implanted in her head, Karasuma Fran went under the name A. O. Francisca, derived from the chemical formula of corundum, subconsciously leaving a hint.

Christmas Day Arc
During the incident at the London Stock Exchange on Christmas Day, Leivinia Birdway informed Stiyl Magnus that Anna Sprengel had been using deals in in old rubies and pure gold metalwork, inheritance of the Rosicrucians, for the money she was spreading around to construct her company R&C Occultics.

During their battle later that day, the St. Germain-infested Kamijou Touma and Anna Sprengel ended up in a jewel store in a department store's jewellery section, which had been affected by the influence of R&C Occultics, offering among other things a December Gematria Special, converting customers' names to numbers free of charge to find gems for them. Several beliefs concerning jewels (including crystal healing and birthstones) were discussed by Touma and St. Germain, as they were attempting to deduce the mechanism behind Anna's spell.