"Diamond State Park is a lamproite, a volcanic rock that together with kimberlites ... 95 million years old at Diamond State Park. Some types of volcanoes, kimberlite and lamproite pipes can ...

The woman was worried that the original rock was too clear ... styles—even those who want a mined diamond for their engagement ring. The two types of products are beginning to look more ...

On today's show: the Planet Money Diamond (or whatever this sparkly rock turns out to be). We get it analyzed by the experts at the Gemological Institute of America. We investigate where it came from.

There's a lot of pressure, the weight of the overlying rock bearing down, so that combination of high temperature and high pressure is what's necessary to grow diamond crystals in the Earth.