I would have to say a "Love Knot Pendant" in Platinum just to show how much you love your woman. That or possibly a tea set (depending on if she likes tea or not).
http://www.gifts.com/birthday/40th-birthday-gifts/woman/NwxyuPhz5 you can set the price range and find the perfect gifts for 40th birthdays. However if you are hosting the party I think it would be pretty cool to get a coordinating gift that goes with the theme of the party.
A romantic bouquet of flowers with candies is a perfect gift for your crush birthday.
Beer.
There are lots of websites online where you can find 40th birthday gifts. One great site that I can recommend is called gifts.com. There are plenty of different gift idea's here for someone who is 40.
The infinitive phrase "to find the perfect birthday gift" is serving as the subject of the sentence. It tells what the speaker finds difficult.
A little tikes car would make a perfect gift for a girl's birthday. We can buy a good quality one with the color of the girl's liking to make it a perfect birthday gift.
subject
get a wrapped gift and put in an emarrassing picture of her that pops out with red streamers.
I'd do a gift card.
subject
The perfect birthday gift to give to a 42 year old woman that has everything is something that could be experienced. For example, the woman may enjoy going to lunch and a movie, or getting a manicure and pedicure.
The Perfect Gift was created in 2005.