gem

noun
1
a precious stone that has been cut and polished and is used in jewellery
گوهر, جواهر, سنگ قیمتی
synonym jewel, precious stone
2
a person, place or thing that is especially good
گوهر, چیز ارزشمند, شخص گران‌بها
This picture is the gem of the collection.
a gem of a place
She's a real gem!
compare jewel