Rare coins investment

After settle the loan application for my housing loan, I may look into rare coins investment soon after suggestion from my office staff. He told me that better use extra money to invest into gold or silver coin instead of buying share. Share market is more risky than gold or silver coin according to him. Well, I am not good at share market, so I better stick to low risk investment. After all my main intention is to make more money instead of just keeping the money into saving account that cannot generate more income. I better tell my hubby first, else he will make noise if I do it without his knowledge.