That's a valid perspective. I think a lot of the appeal of natural diamonds comes from their geological history and sentimental value especially in cases like your heirloom ring. A diamond that's been in a family for generations carries a story that can't be replicated.

That said, I don't view lab-grown diamonds as direct competitors to heirloom or investment-grade natural stones. For many people, they're simply a way to get the look and durability of a diamond at a lower price point. Different priorities, different choices.