Are there diamonds in the mantle?

I understand that the Earth's Mantle comprises a vast majority of our planet's volume, lying beneath the crust. But my question is, amidst the rocky and mineral-rich layers of the mantle, could there possibly be diamonds lurking within? Are there any known instances or scientific theories that suggest the existence of diamonds in the mantle, and if so, what are the conditions that might allow for their formation? It's a fascinating thought, and I'd be intrigued to hear your insights on this matter.