Here some gift ideas for teens -
Book w/cute bookmark (and a gift card)
accessories for MP3/Ipods - such as earbugs, sleves, speakers. CD's and/or itunes gift card
Chocolate/Coffee/Tea/Hot chocolate set
Teenage girls - any kind of makeup sets, my girls love clothes - any designer T-shirt/hoodie type of thing. Just remember to get a gift receipt.
Do they have a digital camera? If not, this could be a big present or camera accessories like a camera case/photo book/scrap booking stuff. My girls also like "spa" kind of things/hair things.
As for the boy?? I have 3 girls (11,14,18) no boys so not sure there.
If you would like some other jewelry gift ideas - I am a consultant for a new unique jewelry and gift company - Allura Designs. www.snowflakegems.com - If you find something that you think your girls would love - just let me know and mention that you are responding to this post and I will give you a 20% discount.
Have a wonderful sunny day - and best of luck with your shopping.
C.