Here are a few options:
julia> using Colors, FixedPointNumbers
julia> c = colorant"#5AC3E3"
RGB{N0f8}(0.353,0.765,0.89)
julia> c = RGB{N0f8}(0.353,0.765,0.89)
RGB{N0f8}(0.353,0.765,0.89)
julia> c = RGB(0.353,0.765,0.89)
RGB{Float64}(0.353,0.765,0.89)
julia> c = RGB(reinterpret.(N0f8, (0x5a, 0xc3, 0xe3))...)
RGB{N0f8}(0.353,0.765,0.89)