There are many wiccans who don't like to wear to wear pentacles or triquetra, simply because they don't like to let others know about their religious beliefs.
I'd say it really depends on who you are as a person and where in the world you live. In general, if you live in a big city, people tend to be more used to people wearing all kinds of stuff and most people wont notice.
If you live on the country side, you may want to be a little more careful. Especially with the pentacles. Some people don't understand what it is and what it stands for and you may very well be accused of being a devil worshiper.
This is something you will have to decide for yourself and you should never let anyone else tell you what to wear or not to wear.
If you ever get in touch with a coven or a group that insist that you must wear a pentacle or something else, then my best advice to you would be to stay away from them!
You should wear the jewelry you want to wear. The jewelry that is meaningful for you.
Wiccan jewelry is very symbolic and has deep and profound meanings for the people who wears it.
So just make sure you understand the symbolism and meaning behind whatever symbol you choose to wear.
Be it a pentacle or another symbol. Like this Triple Spiral Necklace here:
HERE ARE SOME LINKS TO GOOD SYMBOLIC NECKLACES:
The simple pentacle - this is a very straightforward pentacle necklace.
Triple Moon Goddess - This is great if you don't want to wear a pentacle
Pentacle of Power - I really like this one, but it's very big and will surly draw some attention.
Origin: goddesses-and-gods.blogspot.com