Absolutely nothing.
A gold pendant should be worn with a gold necklace. If the pendant has mostly white or another color in it and just a small amount of gold it might look alright with a silver necklace. Try the gold pendant with the silver necklace and see how it looks, if you think it looks good than by all means wear it.
No you do not I'm half Irish
There is a nice 14k White Gold & Pink Sapphire Heart Pendant available on overstock.com
There are many sites which offer heart pendants made with peridot. A site called JeGem sells a Sterling Silver Premium Grade Peridot Heart Pendant. This is 100% handmade.
"Wear your heart on your sleeve" means that you don't hide your emotions. Everyone can see immediately how you feel about something.
Doesn't appear to.
It means someone lost a guardian angel pendant. Nothing else.
Pendant means during or meanwhile in French. It can also be a form of the verb "pendre", to hang.
It can wear off especially when in contact with water or harsh chemicals
The old term is 'you wear your heart on your sleeve.' This simply means that when you are hurt by someone you care about that you do not hold back your feelings and that even by the look on your face your family and friends know your heart is aching.
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