Primarily on the basis of C, N, S, and O stable isotope systematics, this article reviews recent
achievements in understanding diamond formation and growth in Earth's mantle. Diamond …

Perhaps the first point to address in this chapter is what role, or roles, experimental petrology
can play in understanding the formation of natural diamond. As can be seen from the other …

The redox state of Earth's convecting mantle, masked by the lithospheric plates and basaltic
magmatism of plate tectonics, is a key unknown in the evolutionary history of our planet …

Diamonds crystallize deep in the mantle (> 150 km), leaving their carbon sources and the
mechanism of their crystallization debatable. They can form from elemental carbon, by …

The compositions of mineral inclusions from a representative collection (more than 140
samples) of diamonds from the placer deposits in the Ural Mountains were studied to …

Diamond formation has typically been attributed to redox reactions during precipitation from
fluids or magmas. Either the oxidation of methane or the reduction of carbon dioxide has …

We show, by single-crystal diffraction studies in laser-heated diamond-anvil cells, that
Ca2CO4 orthocarbonate, which contains CO44− tetrahedra, can be formed already at~ 20 …

Here we report on successful synthesis of Ge-doped single crystal diamond at high-pressure
high-temperature (HPHT) conditions of 7.0 GPa and 1500–1900° C from an Mg–Ge–C …

At subduction zones, most diamonds form by carbon saturation in hydrous fluids released
from lithospheric plates on equilibration with mantle rocks. Although organic molecules are …

Monocrystalline type Ia diamonds with octahedral growth morphology prevail among
lithospheric diamonds, including precious stones. Unlike less common 'fibrous' diamonds …