Peridot

Peridot (specifically Peridot Facet-2F5L Cut-5XG) is a member of the Crystal Gems who made her debut in "Warp Tour". She was originally a Homeworld Gem technician and a certified Kindergartner. After being stranded on Earth following the events of "Jail Break", she acted as a recurring antagonist until becoming more of an antihero and pseudo-antagonist by establishing a truce with the Crystal Gems in "When It Rains" to help them save the Earth from the Cluster. She officially became a member of the Crystal Gems in "Message Received" after she defied and insulted her Homeworld superior, Yellow Diamond. Peridot is currently living at the Barn with Lapis Lazuli.

Appearance
Peridot has lime-green skin and pale chartreuse yellow hair styled into a tetrahedron shape. Her true eye color is unknown at this time, but can be presumed to be some shade of green or blue, due to being tinted by the yellow color of her visor. Her mouth and tongue are bluish-grey, and she has a pointed upper lip. Her gemstone is located on her forehead and is shaped like an inverted triangle with flattened corners.

In all of her appearances to date, she wears a sleeveless green V-neck uniform. Her suit is mostly medium green, with a dark-green diamond outline around the cut-out of her neck area, meeting to form the Yellow Diamond insignia at her solar plexus, with a dark-green portion between her chest and leggings. Her leggings cover her feet, and feature yellow toes and diamond-shaped knee pads. She is never seen without her visor, which covers the top half of her face and tints her eyes yellow-green. She has a slightly curvy figure, with wide hips, a small waist, and a round chest.

Personality
Initially, Peridot appeared to be her natural self with no limb enhancers, Peridot is rather diminutive, and she becomes very juvenile and paranoid, assuming that harmless household items are "weapons" and that hostility drives every action from the warriors. However, once comforted by Prohyas, she becomes much more relaxed and cooperative, although she still refuses to cooperate with the Warriors and sequesters herself in the bathroom.

Trivia

 * Peridot's specific identification is Facet-2F5L Cut-5XG, as revealed in "Message Received" when Yellow Diamond asked which Peridot she was.
 * She is also an Era 2 Peridot, which are said to be inferior to the previous generation.
 * Peridot has a diamond on her uniform, similar to Lapis Lazuli, Jasper, Sardonyx, Pearl's space suit, and the majority of Homeworld Gems
 * In response to the implication (from her earliest appearances) that Peridot is a "main antagonist", Matt Burnett stated, "Pretty quick to judge poor Peridot... I wouldn't call her an antagonist just yet, and def. not the 'main' one".
 * In Peridot's first appearance in "Warp Tour", she had yellow diamonds on her elbows. These diamonds were no longer shown in later episodes. However, they reappeared on Holo-Peridot in the episode "Friend Ship" and in "Catch and Release".

Gemology

 * Peridot is a gem-quality variety of olivine. It belongs to the forsterite-fayalite mineral series. Peridot is an idiochromatic gem, meaning its color comes from the basic chemical composition of the mineral itself and not from minor traces of impurities.
 * Olivine, of which peridot is a type, is a common mineral in mafic and ultramafic rocks, and it is often found in lavas and in peridotite xenoliths of the mantle, which lavas carry to the surface; but gem quality peridot only occurs in a fraction of these settings. Peridots can also be found in meteorites.
 * Olivine, in general, is a very abundant mineral, but gem quality peridot is rather rare. This is due to the mineral's chemical instability on the Earth's surface. Olivine is usually found as small grains and tends to exist in a heavily weathered state, unsuitable for decorative use. Large crystals of forsterite, the variety most often used to cut peridot gems, are rare; as a result olivine is considered to be precious.
 * Peridot is the official birthstone for the month of August as adopted by the American National Association of Jewelers in 1912. It is also the stone for the Zodiac sign of Libra. Peridot is assigned to the planet Saturn. It may be given as a gem on the sixteenth wedding anniversary.
 * Peridot is one of the few gemstones that occur in only one color, an olive-green. The intensity and tint of the green, however, depends on how much iron is contained in the crystal structure, so the color of individual peridot gems can vary from yellow—to olive—to brownish-green. Its vivid green color does not change under artificial light.
 * Chemically, peridot is a magnesium iron silicate, and its intensity of color depends on the amount of iron it contains. There may also be traces of nickel and chromium present.
 * The best-colored peridot has an iron percentage of less than 15% and typically includes some trace elements of nickel and chromium, which contribute to its color. The most valued color is a dark olive-green.
 * Peridot is the gem variety of olivine and ranges between 6.5 and 7 on the Mohs scale of hardness. It is not particularly sensitive to acid, but it does have a brittle tenacity.
 * The name "Peridot" is believed to have originated from the Arabic word faridat, meaning "gem", or, as the Oxford English Dictionary suggests, it came from classical Latin pæderot - a kind of opal.
 * The ancient Romans called it 'evening emerald' since its color did not darken at night, but could still be appreciated by candlelight and the light of a campfire.
 * Peridot is a healing gemstone often associated with peace, compassion, and harmony of relationships. Its powers are thought to promote growth and renewal while alleviating negative emotions such as guilt, resentment, and apathy.
 * It is a gem especially connected with ancient Egypt, and some historians believe that the famous emeralds of Cleopatra were actually peridot gems.
 * Peridot olivine is mined in Arkansas, Arizona on the San Carlos Reservation, Hawaii, Nevada, and New Mexico at Kilbourne Hole, in the US; and in Australia, Brazil, China, Egypt, Kenya, Mexico, Myanmar (Burma), Norway, Pakistan, Saudi Arabia, South Africa, Sri Lanka, and Tanzania.
 * The name chrysolite was formerly applied not only to peridot but also many similarly colored stones.
 * Even though peridots existed in ancient history, at one point they vanished until some were found 30 years ago in Pakistan.