What Have Diamond Ages Taught Us?
Diamond ages offer insight into continent evolution spanning billions of years.
New Emerald Locality in Southern California
Located about 60 miles east of San Diego, a new emerald deposit has been discovered in the Julian Mining District.
Rhodium-Plated Iron Meteorites
The annual Tucson Gem and Mineral Show has been a reliable source for the niche and the unusual, as seen with the rhodium-plated iron meteorites acquired by author BL at the 22nd Street Show in February 2020.
Snowflake Inclusions in Mong Hsu Ruby
A holiday snowflake scene in a treated Mong Hsu ruby surprises and delights a gemologist in the Bangkok lab.
Artificial Glass Imitating a Paraíba Tourmaline
A creative imitation using fused bluish green glass with copper platelets poses as Paraíba tourmaline.
Chromite Inclusions in Green Common Opal
Black opaque octahedral inclusions with yellow staining confirm the presence of chromite inclusions in an interesting common opal.
Elongated Rutile Crystal in Blue Sapphire from Afghanistan
An orange rutile crystal unusual for its elongated shape appears in a faceted 4.24 ct blue sapphire from Afghanistan.
Metal Sulfide Crystal in a Sapphire
The combination of an iron sulfide crystal and a fingerprint enlivens the inclusion scene in a faceted sapphire from Sri Lanka.
Oiled Tanzanite
A large tanzanite loses its appeal with the removal of its fracture-filling oil.
Unmasking Emerald Filler
A long-wave ultraviolet flashlight illuminates chalky blue fluorescence in a fracture-filled emerald.
Quarterly Crystal: Garnets in Aquamarine
Orange spessartine garnet inclusions are featured in this aquamarine recovered from the Shigar Valley in Pakistan.
Irradiated Blue Diamond
Color engineering with artificial irradiation turns a pinkish purple Argyle diamond light blue.
Blue Apatite in Pyrope-Spessartine Garnet
A garnet is cut and faceted to highlight its unusual inclusion.
Uncommon Inclusion of Lazurite in Ruby from Mogok, Myanmar
A parcel of small rubies was received for identification at the S Gemmological Institute (SGI) gem lab in Yangon, Myanmar.
Pink Sapphires from Madagascar, Rose-Cut Colored Stones from the Baroque Era, Separating Blue Amber Localities, and More…
An overview of the Winter 2020 Gems & Gemology content.
白蝶貝から採取された低品質の有核養殖真珠の表面の外観の改善に関する研究
本研究では、バンコクのラボラトリーが、現地の真珠養殖場から直接採取された5つの低品質の有核養殖真珠を検査し、加工の前後の特徴を記録しました。
A Study on Improving the Surface Appearance of Low-Quality Pinctada maxima Bead Cultured Pearl
GIA Counters Counterfeit Inscriptions
CARLSBAD, Calif. – Feb. 23, 2021 – Recently, GIA (Gemological Institute of America) encountered a number of stones that were submitted for updated reports or verification services that did not match the GIA report submitted with them. The newly-submitted stones were either laboratory-grown diamonds or treated natural diamonds, falsely inscribed with GIA report numbers.