If the skin really parted (as mine did when I had DD1 aged 17) and looked "raw" then sorry, but you'll always have the scar. The colour will fade to silvery white, but the stretching of the skin between the sides of the stretch mark is always going to be there.
If you have fine reddish lines, rather than purple bruised-looking crevasses scored in, then you'll end up with very fine silvery lines which are easily covered with fake tan.
AFAIK, bio oil helps to fade from red to white. I know people who have had laser work on them and this achieved the same thing. The colour changes, but once the skin is damaged, it's damaged for good.
After 13 years of living with them I'm having my third and last baby soon and saving up for a mini tummy-tuck. Cutting away the skin and stretching the good skin down from above, is the only way to actually get rid of them. (I can live with the scar below the bikini line.) I plan to have the bikini body in my 30's that I missed out on in my 20's!
However, I did survive being single in my 20's with a stomach which looked like a road-map, if that helps at all. The first couple of times I had to "show" my stomach was hard, but then I reckoned that any man, who knowingly dated a woman with a child, was shocked by the stretch marks, then he was probably a duffer.
I wasn't short on erm, "suitors" either. Ahem.