What jewel is worth the most?

As an avid collector and investor in precious stones, I often ponder the question, 'What jewel is worth the most?' The debate rages on, with some advocating for the timeless elegance of diamonds, while others swear by the rarity and allure of emeralds. Could it be the deep red hues of rubies that captivate the hearts of many? Or perhaps the unique color-changing abilities of alexandrites that set them apart. But ultimately, what truly determines the value of a jewel? Is it the rarity, the beauty, or the sentiment attached to it? I am eager to hear your thoughts on this enduring question.