Well, it seems that you are quite interested in Smokey Robinson. So, as far as I know, he has got a pair of green eyes, maybe this is due to his mixed blood. However, as you know, sometimes he will appear to have another type of eyes, it is clear that he wears colored contact lenses from time to time, both to have visual aids and make his eyes more attractive. So, what celebrities wear is just what we choose, there are no striking differences.
I am not sure whether Smokey Robinson wears color contact lenses or not. When he was young, I think it should be impossible because color contact lenses just came up in recent years. In recent years, does he ever try color contact lenses, I am not sure either. There are so many stars wear color contact lenses to make their eyes shining and talking no matter they are short sighted or not. I suggest you can have a try. The technology for color contact lenses develops very mature. The color is in the middle layer of the lenses which is consisting of three layers. So the color won't contact your eyeball directly, and won't do harms to your eyes. The color similar to your pupil is very natural. If you are going to some party or ball, you could try some different colors and patterns which can make your eyes sparking.
Yes, smoky robinson wears the colored contact lenses according to the audiences. They say that smokey robinson wears the blue contact lenses which make the eyes look big and attractive. If you want to buy the colored contact lenses, you could go to the online stores to buy one because of the suitable price and good quality.