Rare coin as pendant

I have a pendant that gave by my MIL during my wedding reception. It is one kind of gold rare coin. To me, it is very unique coz I never saw this kind of pendant before. The rare coin contained 99.9% of gold, meaning it is much more expensive than gold 916. Later found out from my hubby that his parent likes to buy gold coin when they have extra cash. Wow, old folks also know how to invest at that time. They sell off many coins when the price getting higher and higher. However they did keep some and make it as pendant and pass on to us.

I am going to keep well my gold coin pendant. I will definitely pass on to my girls when they grow up.