This post (with a couple of updates at the end) is from 2018. Mantle gems include diamonds and peridots. These form under intense heat and
Watch as red zircons are dug out of the soil in Ratanakiri, Cambodia, and turned into sky-blue gemstones by heat treatment in somebody’s back-yard mini-furnace.
Aquamarine is a beryllium mineral like bertrandite or beryl, but its chemical formula is slightly different. Who would suspect that the addition of a little
Diamonds aren’t the only mantle-associated gems. Most of the upper mantle is made out of peridotite, a combination of olivine and pyroxene. It is named after the very famous gemstone it contains–peridot.