Hello everyone! I wanted to purchase a Tiffany DBTY single pendent necklace last week and I felt very lucky to find this thread because the information/advises you ladies provided were very useful. I managed to find my ideal one, so I'd like to shall my experience too in case it could be useful to someone else. But forgive me for the language mistakes I make for I'm not a English nature speaker
There were 3 things that I wondered the most before the purchase :
1. What size of diamond should I choose?
2. Is it comfortable to wear it in every day life?
3. Should I buy it in YG or Plat. ?
These are the things we can't know just by visiting the website of Tiffany.
Since there is no Tiffany store in my city, I went to Paris to try them. And finally, I got myself a 0.14 pts. plat. one with the 16" chain. I've been wearing it ever since, as layered necklace or all alone. It sits still, not always in the very middle but always in the front (it moves sometimes a bit to the left or to the right, but never gets too far and I kind of like the way it looks when it's not in the very middle of my neck). It doesn't flip at all. It doesn't poke (even with all my winter clothes) unless I push it very hard into my skin with my finger

The diamond is very sparkly and the necklace is very delicate.
I preferred the YG for many reasons before I went to the store. Also, I preferred the design of it in YG/Plat. than in RG/Silver. In the end, I bought the platinum one. I know that platinum could look kind of grey but I truly love the color. The SA told me that I could feel free to wear it even when I go to the beach or simply in showers.
Personally, I found that the 0.14 pts was the best size for THIS KIND of necklace. If I want to get a bigger stone, I will surely choose another kind of necklace/pendent - a more "classic" type. However, that's just a question of personal preference.
I'll try to post a pic but I'm really not good at it so let's see if it works... I took the photo with my cellphone. The necklace looks way better in real.
http://imageshack.us/photo/my-images/717/img0694ul.jpg