For 10 points, identify this precious gemstone, an allotrope of carbon with Mohs scale hardness of 10.
Along with spinel and blend, this structure is found in Anderson-Payne refractometers. Lee and Walmsley demonstrated macroscale quantum entanglement in these objects. Nanowires made of these structures make use of their nitrogen vacancy centers for optical applications. These objects have been found in lamproite deposits near Argyle lake and they are most commonly found in kimberlite pipes. They are used in anvil presses to simulate high pressure environments. The atoms in this crystal have sp3 hybridization. This crystal is imitated by cubic zirconia. For 10 points, identify this precious gemstone, an allotrope of carbon with Mohs scale hardness of 10.
Along with spinel and blend, this structure is found in Anderson-Payne refractometers.
diamond