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Grey Diamond has grey skin and very dark grey hair, in a bob with bangs. Her eyes are a lighter shade of grey with diamond shaped pupils. Her gemstone is In the shape of a Diamond, and is located on her navel. Although she is smaller than her fellow diamonds, she holds the same status as them and still towers over other gems.
In her first form, Grey Diamond wears a top with white poofy sleeves and grey patterns, and a skirt with patterns in various shades of grey. She also wears grey flats. In her second form, she wears a dress that is open in the front, and a pair of grey shorts along with a white cape and white boots.