I have my heart set on a fancy light pink diamond no smaller than 1ct; however, my the price point is killing me! With that said, what are your thoughts on an HPHT GIA diamond?? Worth it or not?
Only you can determine if it's worth it to you. We don't have any information to determine if a particular stone is "worth it". If you want to ask about a specific diamond it would be more helpful.
Unless you have a very healthy budget for a natural fancy light pink diamond at 1 carat or more, you need to either compromise on size, or possibly look at a "light pink" or "very light pink" that once they are set will look more like a fancy light pink, or look for a brown modifier in a pink diamond. I, personally, would recommend those options over a treated pink. Most treated pinks began as light brown diamonds. Frequently,but not always, they are poorly cut diamonds.
eta- I just looked at your other threads. If you can afford it- buy that brownish pink oval at diamonds by Lauren. It will be stunning once it's set in rose gold and it faces up at a really nice size!!