Throughout the entirety of The Lord of the Rings franchise, there are a vast multitude of treasures that both motivate and tempt its heroes and villains alike. From the hoard of gold that Smaug guarded for decades to the Arkenstone that would prove Thorin Oakenshield's right to rule. Even the weapons wielded by the book's heroes are often lost treasures of bygone eras, forged from enchanted metals and carrying entire histories within them. Yet, no treasure has more power within the minds of mortals and immortals alike than that of the Silmarils.
Source:https://www.cbr.com/lotr-silmarils-explained/