资讯

The history of Baja California has been closely tied to the exploitation of pearls since the 16th century.
Ruby is an incredibly durable gemstone if there are no treatment-related durability concerns. - Courtesy Jan Goodman Co. Hardness and toughness Gem and mineral hardness is measured on the Mohs scale.
Eight decades after the Cullinan diamond was mined, a team of gemologists examined the two famous gems that were created from it to become part of the Crown Jewels of England.
The island of Borneo is one of the oldest known —and least reported on—sources of diamonds. Although diamond mining historically was concentrated in the western area of what is now Kalimantan, recent ...
Figure 1. Pleochroism in a 15 ct tanzanite, as seen with the unaided eye through the crown and the pavilion sides and ends. Photo by Wimon Manorotkul. ABSTRACT While virtually all gemological texts ...
Discusses the role of three-phase inclusions in emerald, in combination with spectroscopy and trace-element analysis, in determining geographic origin.
Feature Gems & Gemology, Fall 2014, Vol. 50, No. 3 Observations on Pearls Reportedly from the Pinnidae Family (Pen Pearls) Nicholas Sturman, Artitaya Homkrajae, Areeya Manustrong, and Nanthaporn Somsa ...
Sapphire, the September birthstone comes in all the colors of the rainbow – except red. Learn more about the birthstone of wisdom, loyalty, and nobility and discover its history and where it can be ...
Figure 1. This 0.11 ct round brilliant grandidierite is from a new deposit near the town of Tranomaro, in southern Madagascar. Photo by Delphine Bruyère. ABSTRACT A new deposit of grandidierite, ...
A guide describing frequently encountered gem treatment processes, their detection, and special care tips for treated gems.
All fees are charged in the currency of the location where the item is submitted for service. To view fees, chose your gemstone type and currency ...
Documents a series of visits to Myanmar in search of exceptionally bright pinkish red spinels possessing no dark tones.