Gem Symbols

Stars

 * Many Crystal Gem outfits and weapons have five-pointed stars.
 * Rose Quartz's dress has a star-shaped cutout over her gem.
 * Garnet's debut and Season 2 outfits have star designs on the chest, and Garnet's gauntlets have yellow stars over the knuckles.
 * However, Ruby and Sapphire do not have stars on their outfits.
 * Pearl's debut and post-regeneration outfits both have a yellow star symbol on the chest and Pearl's spear has a star shape at the end of the shaft.
 * Amethyst's pre-regeneration outfit has star-shaped cutouts over the knees. Her post-regeneration outfit has black star patches over the knees and Amethyst's whip handle has a star shape at the top.
 * Steven's t-shirts have yellow star symbols on the chest.
 * Alexandrite's outfit has a star-shaped collar.
 * Sugilite's outfit has ripped knees. The rip over her right knee looks like a broken/slashed-through star. The nail polish on Sugilite's index fingers also has a star-shaped pattern. Her flail has a silver star-shaped ring connecting Amethyst's whip and Garnet's gauntlets.
 * Her second appearance, shown in Cry For Help, has whole stars on her knees.
 * Opal's outfit has a star on the bottom of her dress, and stars at each end of her bow's handle.
 * Stevonnie's t-shirt (like Steven's) has a yellow star symbol on the chest under Connie's dress.
 * Sardonyx has a black star on her shirt, underneath her bowtie, and a yellow star protruding from the top of her war hammer.
 * Holo-Pearl's current design features a five-pointed star in the same location as Pearl's outfit.
 * A five pointed star also appears on the Temple Gate.
 * Alexandrite's outfit has four-pointed star cutouts over her knees.Joy Ride (50).png
 * The Mirror in "Mirror Gem" has an eight-pointed star on the face. As Steven pulls out Lapis Lazuli's gemstone, the surrounding water takes on a similar but more elaborate pattern.
 * In "Joy Ride", the crash site of Peridot's escape pod was surrounded by a crop circle pattern with a four-pointed star at the center.

Triangles

 * On the floors of the Pyramid Temple and the Gem Warship, there is a symbol with three interlocking triangles, surrounded by a larger triangle and a circle. The version on the Gem Warship is colored, and the inner triangles are white, blue and yellow.
 * Where the 3 main triangles meet, there is a single, smaller triangle.
 * Rose's symbol has a triangle in the middle.
 * Lapis Lazuli's outfit has two dark blue triangles, an upward-pointing one on her top and a downward-pointing one on her skirt.

Lozenge / Rhombus / 4-pointed Diamond Symbols

 * On Holo-Pearl's former, debut outfit in "Steven the Sword Fighter" is a small diamond, replacing Pearl's five-pointed star.
 * There is a pink diamond on Pearl's flight suit in "Space Race", in place of her five-pointed star.
 * Lapis(1).png two dark blue triangles on Lapis Lazuli's dress form a lozenge shape split in half across the middle.
 * Both Peridot and Jasper have yellow diamonds on their outfits. Peridot has a yellow diamond on her chest and two on her knees. Jasper has a yellow diamond on her chest.
 * Sardonyx's shoes have pink diamonds on them.
 * In the Ancient Sky Arena in "Sworn to the Sword", a series of four lozenge symbols can be seen. Clockwise from the top, they are colored white, blue, pink and yellow.
 * These four lozenge symbols can also be seen inside the Ancient Gem Colony Ship in "Friend Ship."
 * This symbol resembles the National Fire Protection Association label, upside down.

Triangle and Lozenge Patterns
"These are symbols seen as some sort of Homeworld-designed symbol, way more complicated than the lozenges. They have lozenge-like diagonal patterns. They were seen:"
 * At the Pyramid Temple walls.
 * Joy Ride (49).pngot's flare shoot by her Escape Pod in "Joy Ride", which helped the Crystal Gems to find it.
 * A similar one appears marked in the grass of the field, but with less lines.
 * On the Communications Hub's pillars.

Rose's Symbol
A symbol resembling a stylized rose. Versions of the symbol appear in various locations:
 * At the center of Steven's shield. Jasper immediately recognized the symbol when she saw the shield in The Return.
 * On Rose's Battle Flag.
 * On Rose's Scabbard.
 * On Rose's Pedestal.
 * On the Temple Gate when it opens into Rose's Room.

Crop Circle Symbols
Symbols resembling crop circle designs can be seen on various Gem buildings.
 * On the floor at the Galaxy Warp.
 * Outside the Ancient Sky Arena, carved on the outer wall next to the four lozenge symbols.