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A Study of the Winston Red: The Smithsonian's New Fancy Red Diamond
Presents the first scientific and historical study conducted on the 2.33 ct Winston Red, the fifth-largest known Fancy red diamond in existence.
Optical observation along with spectroscopic, cathodoluminescence, and photoluminescence analyses confirmed the presence of plastic deformation bands and dislocation network patterns that classify the Winston Red as a type IaAB (A) Group 1 “pink” diamond and indicate that it underwent significant pressure and temperature conditions. An absorption spectrum spanning across the visible to near-infrared range (400–987 nm) was recorded with a custom-built GIA instrument using a fiber-coupled spectrometer (Ocean Optics QE Pro), a multicore reflection probe, and a tungsten-halogen light source (Avantes AvaLight-Hal-S-Mini). Unlike for some gem minerals, the geographic origin of gem-quality diamonds that formed deeper in Earth’s relatively geochemically homogenous mantle cannot be determined based on the usual combination of inclusions, spectroscopic characteristics, and chemistry (e.g., Smith et al., 2022).
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