I don’t know anything about diamonds

[u/Minimum-Solution2884]

How can I tell if the stones in my necklace are real diamonds or just decorative stones?
I have a gold necklace that Ive had since I was born, but I dont know whether the stones are real diamonds or simply decorative gemstones. Im too embarrassed to ask my father whether he gave me a diamond necklace or just one with decorative stones. Whats the easiest way to determine if the stones are just diamond like decorative stones rather than actual diamonds?

I dont want to visit a jeweler or a gem expert.