Diamonds are intrinsically worthless , of all the precious stones they are pretty much the least precious , if you were to take random samples from the earth globally and take an average , you would find diamonds practically everywhere and easily 100x more then say emerald (green beryl) which that being said some variations of “common” gemstones are so extraordinarily rare that they have an actual scarcity such as bixbite (red emerald ) and are super valuable but it’s hard to find any jewelry made from them