Minor Characters/Gems

Minor Gem Characters are Gems who have debuted and been identified, but, as of yet, hold no significant nor recurring roles.

Rubies
All Rubies shown thus far, including the Crystal Gems' Ruby, are voiced by Charlyne Yi.

Ruby (right shoulder gem)
Ruby is a Gem who appears in "The Answer".

She appears to be identical to the Crystal Gem Ruby and the other Ruby in their Gem trio in appearance, clothing, and voice. She and the other Ruby seem to be obsessed with fighting. Her gemstone is also identical and is placed on her right shoulder.

Ruby (right back-hand gem)
Ruby is a Gem who appears in "The Answer".

She appears to be identical to the Crystal Gem Ruby and the other Ruby in their Gem trio in appearance, clothing, and voice. She and the other Ruby seem to be obsessed with fighting. Her gemstone is also identical and is placed on the back of her right hand.

Ruby (triple fusion)
Ruby is the fusion of all three Rubies in "The Answer", one of which being Crystal Gem Ruby.

As their individual forms and gemstones are the same, their fusion remains identical except much larger in size. In this form, they are much more powerful. However, the actual extent of their strength in this form remains unclear because they fought against Rose Quartz, an extremely skilled and powerful warrior. The Crystal Gem Ruby describes the fusion as just "me, but bigger," implying the state of being is not that different for her unfused.

Ruby / "Eyeball" (left eye gem)
Ruby, also known as "Eyeball" in the credits, is a Gem who appears in "Barn Mates" and "Hit the Diamond".

She arrives on Earth in the Roaming Eye, climbing out of the crashed ship in the very last scene of "Barn Mates".

She is a part of the Ruby troops sent by Yellow Diamond. She seems to be the most invested in the mission to track Jasper and is the most stoic, barely saying anything, and even anxious. She initially appears to be very intimidating, but she reveals to be quite polite when she thanks the Crystal Gems for their cooperation. Her outfit consists of the regular Homeworld uniform. She has the lightest complexion among the Ruby troops. Her gemstone replaces her left eye.

Ruby / "Doc" (chest gem)
Ruby, also known as "Doc" in the credits, is a Gem who appears in "Hit the Diamond".

She is the leader of the Ruby troops sent by Yellow Diamond to retrieve Jasper. She is assertive and a natural leader, professional in her actions. Her complexion is the same as the Crystal Gem Ruby's in color, but she wears a yellow transparent visor similar to Peridot's and a pair of red shorts, held on by a pair of black suspenders that have two halves of a yellow diamond on the edges. Her gemstone is located on her chest.

Ruby / "Army" (left shoulder gem)
Ruby, also known as "Army" in the credits, is a Gem who appears in "Hit the Diamond".

She is a part of the Ruby troops sent by Yellow Diamond and is the most violent of all. She is always fighting with something or someone and gets angered easily. Her skin hue is more orange in color than the other Rubies, and her gemstone is on her left shoulder. Her outfit is the general Homeworld design, with red shorts, and a top with a deep triangular collar, with black trims that meet to form a yellow diamond sign. She also has a unibrow.

Ruby / "Navy" (navel gem)
Ruby, also known as "Navy" in the credits, is a Gem who appears in "Hit the Diamond".

She is part of the Ruby troops sent by Yellow Diamond and appears to be way more gleeful and sensual than the other Rubies of the troop. She is soft-spoken, amused by the Earth, expresses constant satisfaction, is oblivious to everything and dramatic in her mannerisms. Her gemstone is in the umbilical region of her stomach. Her outfit features a backless, red shawl-like top on her torso that opens around her solar plexus, and has a yellow diamond on the collar. She has more of a cherry complexion. Although Navy is a shade of blue, which does not match the Ruby's color palettes, this is, in fact, a reference that her gem is located in where her navel would be, hence her nickname.

Ruby / "Leggy" (left thigh gem)
Ruby, also known as "Leggy" in the credits, is a Gem who appears in "Hit the Diamond".

She is a recently created Gem, who is on her first mission with the Ruby troop, referred to as "Newbie" by her fellow Rubies. She seems to be the most disoriented and confused, never knowing quite what to do. She is also the most fearful, frequently hiding behind other things. Her outfit is the regular Homeworld uniform, with her gemstone on her left thigh. Her complexion is the darkest of the Ruby troop, being more of a burgundy color.

Ruby (quintuple fusion)
Ruby is the fusion of all five Rubies in "Hit the Diamond".

As their individual forms and gemstones are the same (minus the left eye gemstone fitting over the left pupil), their fusion remains identical except a larger size, and a slight outfit variation (including one Ruby's yellow visor).

Blue Diamond's Pearl
Blue Diamond's Pearl, also known as Blue Pearl is a Gem who appears in "The Answer".

Physically, she appears almost identical to the Crystal Gems' Pearl and Yellow Diamond's Pearl, as she also possesses a thin, tall build, a pointed nose, and pixie haircut.

She has sky blue skin and chin-length, messy, periwinkle hair. In the fashion of her owner, Blue Diamond, the upper portion of her face is covered by her bangs. While it is not shown in the actual series, she has at least one eye, as seen in a drawing by Joe Johnston. Her outfit consists of a periwinkle bodysuit with an open diamond-shaped keyhole neckline, a knee-length, frost blue, sheer skirt, and no footwear. Her gemstone, a powder-blue pearl, is on her chest and is a round polished cabochon.

She appears to be either relatively apathetic to what's happening around her or doesn't speak unless spoken to, the likely reason being that she is scared of Blue Diamond.

Yellow Diamond's Pearl
Yellow Diamond's Pearl, also known as Yellow Pearl in the credits, is a Gem who appears in "Message Received". She works as Yellow Diamond's receptionist, taking her call on the Diamond Communicator.

Her build and facial features are similar to that of Pearl of the Crystal Gems and Blue Diamond's Pearl. She sports a beige or pale peach maillot with a similar bustline to Blue Diamond's Pearl. She also wears puffy, canary yellow, sheer shoulder sleeves, and no skirt, as well as pale yellow long stockings and bright yellow flats. In the fashion of her owner, she has a puffy yellow pixie haircut that is pointy and in a similar bob design and pale yellow skin. Her gemstone, a yellow pearl, is on her chest and is a round polished cabochon, similar to Blue Diamond's Pearl.

She is shown to have a bad temper and finds satisfaction in other's misfortunes, as well as having a fearful attitude towards Yellow Diamond, to whom she refers to as "My Diamond", much like Peridot.

She is voiced by Deedee Magno-Hall, who also voices the Crystal Gem Pearl.

Trivia

 * It appears so far that Gems of the same gemstone also share the same voice, albeit with some differences in tone. Their appearances are also nearly identical, except the gemstone placement and minor details.
 * According to Ian Jones-Quartey, if the Pearls fused, they would form a bigger Pearl with combined colors.
 * In "Hit the Diamond", it is revealed that Rubies are typically unintelligent and easily fooled.