Another lovely post about friendship... and once again very little work for me to do as teacher, as you have made only a couple of minor errors in your English.
When you say 'everyone in the world' - this is a singular subject, so you have to match it with the singular verb 'has': so 'everyone has' rather than 'everyone have'.
You also talk about a diamond which you say 'despite through time', 'it's still shining in the dark'. You need a verb for the first part, so we would say something like 'despite being buried for a long time' or 'despite being hidden throughout time'... and then for the tense in the second part, we would use the present simple as it's something that is not just happening at the moment but again and again - so 'it still shines in the dark'.
I really like your use of language in evoking the meaning of friendship. It inspired me to look again for some relevant quotes. I hope you enjoy these:
Quotes About Friendship
"Friendship is born at that moment when one person says to another: "What! You too? I thought I was the only one."
― C.S. Lewis
"Don't walk behind me; I may not lead. Don't walk in front of me; I may not follow. Just walk beside me and be my friend."
― Albert Camus
"A friend is someone who knows all about you and still loves you."
― Elbert Hubbard
"It is not a lack of love, but a lack of friendship that makes unhappy marriages."
― Friedrich Nietzsche
"There is nothing better than a friend, unless it is a friend with chocolate."
― Linda Grayson
"It's the friends you can call up at 4 a.m. that matter."
― Marlene Dietrich
"A friend is one that knows you as you are, understands where you have been, accepts what you have become, and still, gently allows you to grow."
― William Shakespeare
I would love to read some more quotes about friendship. Why don't you all try and make up your own?
Here's mine to start you off -
"A good friend is someone you may not see for a long time, but when you do, it's like you were with them yesterday."
Finally, there's an expression in English that says a dog is 'man's best friend'... do you agree?!