Rubies and sapphires are of both scientific and commercial interest. These gemstones are
corundum colored by transition elements within the alumina crystal lattice: Cr 3+ yields red …

The aim of this chapter is to review the locations, mineralogy and briefly the origins of the
major gem deposits in Myanmar. Myanmar is fortunate in containing world-class gem …

The Mawchi Mine in Myanmar is a historic world-class Sn–W deposit within the tin province
of Southeast Asia, extending from Yunnan in SW China through Myanmar and Thailand, via …

Abstract Sapphires in the Ilmen Mountains of Russia's South Urals are found in syenite
pegmatites where the mineral forms blue transparent to translucent megacrysts up to 6 cm in …

Mogok gem corundum samples from twelve localities were analyzed for trace element
signatures (LA-ICP-MS method) and oxygen isotope values (δ18O, by laser fluorination) …

Corundum is rarely found in situ within alkali syenites. A corundum-bearing syenite was
found in the Yushishan rare metal deposits of the eastern section of the Altyn Tagh fault in …

The geographic origin of gem corundum has emerged as one of its major value factors.
Combined with gemological observations, trace element analysis is a powerful tool for the …

Kyshtymites are the unique corundum-blue sapphire-bearing variety of anorthosites of
debatable geological origin found in the Ilmenogorsky-Vishnevogorsky complex (IVC) in the …

Metamorphic gem corundum (mainly ruby) deposits are robust indicators of continent-
continent collision processes. However, a systematic link of primary magmatic blue sapphire …

The aim of this study was to explore the feasibility of quantitatively evaluating a sapphire's
color by analyzing gemstone images. The color characteristics of gemstones through …