Is Sony SEL50F18 the only e-mount option for 50mm?

I'd like to get a 50mm e-mount lens to use for portraits on my NEX-7, but the Sony SEL50F18 only seems to come in silver which would not look good on my black NEX-7.

- Why does Sony not offer the lens in black?

- Are there any 50mm e-mount lenses offered by other manufacturers like Tokina, Sigma, etc.? I wasn't able to find any.

Thanks,

George