Jewel
Walnut Creek?
35.309358, -77.867517

There are no jewel found when I get there.
What should I deal with this?

a couple of things:

1--have you collected 50 jewels before that? if so cash them in and try again. you can only collect 50 jewels at a time before you cash them in and the next one will show up
2--you might need to zoom in even closer to get a jewel to show up
3--go through THIS THREAD (http://www.gewar.net/forums/showthread.php?t=6961) and towards the end you will find the latest jewel file. download that and use it

The jewel doesn't exist there. I just checked my jewel file and it's off QUITE a couple of degrees.

As for solving the problem I suggest you use http://www.gewar.net/forums/showthread.php?t=7919&page=4&pp=10
This file, on the 2nd post. It has everything that I know of.

Some of them are really weird compared to their Google Earth position, and that file solves it.