Phase transformations as important markers for heat treatment detection of corundum and other gemstones (2023)
Presentation by Michael S. Krzemnicki, Pierre Lefèvre, Wei Zhou at the International Gemmological Conference IGC 2023 in Tokyo, Japan.
Visit to the Mong Hsu ruby deposit in Myanmar (Burma)
Mong Hsu is one of the reputed ruby deposits in Myanmar (Burma). It is located about 250km southeast of Mogok, in the Shan State, in northeastern Myanmar.
Beware of synthetic ruby with ‘zircon-like’ cluster inclusions
Very recently, we tested a tricky case of a synthetic ruby (Figure 1) of 4.27 ct, submitted to SSEF as a natural stone accompanied by two lab reports confirming its natural origin. Under the microscope, the submitted stone showed ‘zircon-like’ cluster inclusions (Figure 2). They were somehow reminiscent of
Heated ruby from Mong Hsu (Myanmar) with blue zone
Rubies from Mong Hsu, located about 250 km southeast of the Mogok Stone Tract, entered the gem trade in the early 1990s. Since this time the Mong Hsu mines remain an important source for Burmese rubies, specifically for stones of smaller sizes (2 ct and below).
Update on unheated Mozambique rubies
by Dr. M.S. Krzemnicki, first published in Facette […]
Low-Temperature Heated Rubies From Mozambique
by Dr. Michael S. Krzemnicki, first published in F […]
Vanadium-rich Ruby from Mogok, Myanmar
Mogok-type rubies are known to contain small but distinct amounts of vanadium (often in the range of 0.015 – 0.025 wt% V2O3), but are commonly highly dominated by chromium (approximately by a factor of 20-100 x) responsible for their often attractive and saturated red colour and strong fluorescence. In some c
Age Dating on Ruby set in Iconic Ruby Necklace by Harry Winston
by Dr. M. S. Krzemnicki & Dr. H.A.O. Wang, first pu […]
