Sheldon tilted his head. “Mom, value is subjective. A diamond’s value comes from rarity and marketing. Moissanite is rarer in nature but cheaper to make. However, this ring was your mother’s. Its sentimental value is infinite. The rock is just a rock. The meaning is what you assign to it.”
Here’s a based on those ideas: "Sheldon and the Case of the Sparkly Rock" Sheldon Cooper sat at the breakfast table, spoon hovering over a bowl of Cheerios. His mother, Mary, was unusually quiet, twisting a small velvet box in her hands. young sheldon s02e08 hevc
Sheldon stepped in. “Correct. But it is moissanite. It’s almost as hard as diamond, more brilliant, and environmentally friendly. If she rejects you because of the gem’s chemical composition, she’s failing basic material science and human decency.” Sheldon tilted his head
Mary smiled. “When did you get so wise?” Moissanite is rarer in nature but cheaper to make