I just received Julep Daphne in my July Julep Maven box. The first polish that came to mind as a dupe was Essie Turquoise & Caicos. Daphne is a lot darker and more of a muted teal/turquoise than Essie T&C. It actually looks a lot darker on the nail than it does in the bottle. This applied beautifully. It was actually a tad thick, but I welcome that when I compare it to Turquoise & Caicos, which is very sheer.
I have been very pleased with Julep nail polish so far. I thought I would use my 1 cent box and then cancel, but I don't think I'll be cancelling anytime soon. I have been very happy with every box. If you are interested in Julep Maven, feel free to use the referral link on my page - or just go straight to their website. Also, you can get your first box for 1 penny using code COLOR2012. No shipping, etc....just 1 penny:)
Here is a comparison of some of the dupes I have in my collection. As I said above, at first I thought Turquoise & Caicos would be a dupe, but Daphne is quite a bit darker. The closest would probably be Sinful Colors Mint Apple, but that has a bit of shimmer. In conclusion...Daphne is very unique and a very pretty teal - I highly recommend it!