Both are gorgeous! It's OK to have more than one key from tiffany. I do too. One with less diamond which I wear for more casual look. One with full diamonds for more dressy evenings. I'd say, keep the one u bought for yourself. It holds special meaning too as it's your own money. And your husband can get you the full diamonds for anniversary! You can also look at other designs in full diamonds if you want variety. Happy birthday !!
Thanks for your thoughts and birthday greeting! What you said really resonates with me. The rose gold is easier for daily wear and reminds me to keep working hard for my family and myself!