Since 2002, tsavorite and other grossular varieties have been recovered from a primary deposit at Itrafo, a village in the Andrembesoa area of central Madagascar.

Overview and commentary on the 2014 Optics & Photonics News article “Diamond Raman Lasers.”

Examination of a diamond with a rare and highly sought-after Fancy reddish brown color revealed that it had been irradiated and coated.

A Fancy orangy yellow “cape” diamond featured an unexpected 480 nm band, a defect normally associated with orange color.

A coated rough rock crystal resembles a purplish red ruby.

A greenish yellow material set in a ring as a peridot imitation is identified as synthetic cubic zirconia.

Beads with an unusual metallic luster are found to be kornerupine with a coating possibly made with copper.

Spectroscopy and microscopic observation reveal that areas of a natural green jadeite carving have been dyed.

A hibonite of unusual size examined in the Carlsbad lab is host to a spinel inclusion.

The first faceted eosphorite, a member of the childrenite-eosphorite series, is seen in the Carlsbad lab.

Material submitted as a rough diamond is revealed through gemological testing and analysis to be a near-colorless topaz.

了解锂紫玉的坚固性，以及如何护理锂紫玉珠宝。

了解人们如此热衷锂紫玉的原因。

了解青金石的坚固性，以及如何护理青金石珠宝。

在印度神话中，月光石是凝固的月光形成的，据说可以带来好运。

了解人们如此热衷于月光石的原因。