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.

Pearls
All Pearls shown thus far, including the Crystal Gems' Pearl, are voiced by Deedee Magno-Hall.

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, Yellow 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, similar to Yellow Pearl's, 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.

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. She refers to as "My Diamond", in the fashion of other Homeworld gems like Peridot, Sapphire, and Blue Pearl. Yellow pearl also seems to enjoy being leader or having control, as when she reminds Blue Pearl to sing with her and talks in a demeaning tone to Peridot. She speaks with a high-pitched nasal voice, sounding much like Lily Tomlin's character 'Ernestine the Operator'

Ruby (triple fusion)
Ruby (triple fusion) is the fusion of all three Rubies in "The Answer", one of which is the 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 (quintuple fusion)
Ruby (quintuple fusion), also known as Giant Ruby in the credits of "Back to the Moon", is the fusion of all five Homeworld Rubies.

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 Doc's yellow visor).

When first formed, the Ruby fusion had a firm and interrogative tone, and asked threateningly for the location of Jasper in her debut, "Hit the Diamond". This was likely the Doc part of her, as her mood matched the personality of that Ruby. However, once given the answer, her voice became higher and happier, a complete mood swing, which was similar to that of the Ruby nicknamed "Leggy."

Formed for the second time, Giant Ruby fused when the Rubies realized they had been tricked for the second time. Originally confronting Garnet, Amethyst, and Pearl, the fusion turned her anger on Steven when she saw he was about to open the door to the Moon Base. At first, the Giant Ruby held out by placing her hands onto the doorframe to keep from being swept out, but Sardonyx made an appearance, seen brandishing her hammer. The force of Sardonyx's attack was enough to both release Giant Ruby's grip on the doorframe and defuse the gem.

Most of the Rubies in the fusion made their debut in "Hit the Diamond", as well as the fusion itself. Eyeball made her debut in "Barn Mates".

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 with their outfits.
 * According to Ian Jones-Quartey, if the Pearls fused, they would form a bigger Pearl with combined colors.
 * This idea is shown when the Rubies fused.
 * In "Hit the Diamond", it is revealed that Rubies are typically unintelligent and easily fooled. Being as Rubies are the Gem equivalent to foot soldiers and common enough to be effectively expendable, high intelligence isn't a necessity.