Spectroscopic Characteristics of Low-Temperature Heated Blue to Violet Spinel
Although spinel is rarely treated, there have been some heated spinels available in the trade.
Heat Treatment Effects on the Behavior of the 3161 cm–1 Feature in Low-Iron Metamorphic Yellow Sapphire
This study examines FTIR spectra of yellow sapphire heat treated in an oxidizing atmosphere to deepen its color.
Fura Gems’ Inaugural Ruby Sale
Fura Gems hosted its first sales event for rough Mozambican rubies in August and September 2021.
FTIR Observation on Sapphires Treated with Heat and Pressure
A study on heat with pressure treatment of blue sapphires reveals FTIR patterns associated with different iron concentrations.
.jpg "YMAL GIA Ed")
