Rainbow Quartz has pink skin and long, voluminous, wavy blondish-white hair. She is roughly the same height as Opal, and has a slightly similar build, only being heavier and shorter. Rainbow Quartz has two sets of eyes and only one pair of arms. Her top pair of eyes are colored sky-blue, resembling Pearl's, while the bottom pair are black and resemble Rose's. The Pearl-like eyes are much larger and prominent, suggesting Pearl is slightly dominant in this fusion. Her nose is pointy like Pearl's and wide and upturned like Rose's. Her mouth is similar to Rose Quartz's, but without lipstick.
She wears a sleeveless, full-body leotard with the body colored white, and the leg region colored purple. There is a stylized four-pointed star, with the left and right arms of the star bent upwards, cut out on her stomach area of the leotard. She also has a loose, pale blue, diaphanous, long-sleeved shirt worn over her body. Her outfit comprises of no footwear, but instead has long, pink leg-warmers that cover half of her lower legs and feet.
The term "rainbow quartz" can refer to two different types of gemstones:
Iris quartz, sometimes also marketed under the name "rainbow quartz" or "anandalite", is a quartz crystal displaying internal spectral colors under some of the crystal faces.
Metal-coated quartz, which is artificial, has a metallic rainbow coloration on the surface, and is created by applying a microscopic layer of metal (typically titanium) to a heated quartz crystal via vapour deposition.
Rainbow Quartz is not a traditional birthstone.
Rainbow Quartz are associated with hope and optimism.