Fluorescence Produced by Optical Defects in Diamond
How variations in UV lamp output can affect observed fluorescence color and intensity.
Spiral Patterns on a Non-Nacreous Pearl
Cat’s-Eye Nephrite Jade from Washington State
Cat’s-eye nephrite jade from Washington State. Washington Jade (Edmonds, Washington) made its Tucson debut at the AGTA show with nephrite jade from Washington State.
Dyed Non-Nacreous Pearls
Pinctada maxima Pearls from Operated Mollusks, Sudoite in Ceramic-Age Caribbean Jewelry, Persian Turquoise Field Report, and More
Purple Gem Spinel from Vietnam and Afghanistan: Comparison of Trace Element Chemistry, Cause of Color, and Inclusions
Figure 1. The vivid colors seen in fine gem-quality spinel are derived from the mixing between multiple different chromophores in a range of ratios and concentrations, as in this fine 13.52 ct violetish purple spinel. Courtesy of the Dr. Edward J. Gübelin Collection. Photo by Robert Weldon/GIA.
Cause of Color in Yellow Sapphire, Plus Characterization of Oregon Sunstone, Ukrainian Beryl, and British Columbian Iolite
Aquamarine with Zigzag Growth Line Inclusions
Blackish Green Omphacite Jade from Guatemala
A Guatemalan jade called yongchuliao has gained popularity among Chinese buyers.
Chicago Responsible Jewelry Conference
A report on the seventh annual Chicago Responsible Jewelry Conference.
Turquoise United Conference 2023
Iolite from the Thor-Odin Dome, British Columbia, Canada: Geology, Chemical Composition, Inclusions, and Cause of Chatoyancy
Reports on the geological setting and gemological properties of violet-blue gem cordierite from new deposits located in British Columbia.
Etch Pits in Heliodor and Green Beryl from the Volyn Pegmatites, Northwest Ukraine: A Diagnostic Feature
Examines dissolution features of heliodor and green beryl from a Ukrainian pegmatite field and offers criteria to distinguish them from samples found in other localities.
Natural Rubies with Glass-Filled Cavities
Separating Glass-Filled Rubies Using the DiamondView
The DiamondView instrument is able to identify glass as the filler in a pair of heart-shaped rubies.
Fraudulently Inscribed Synthetic Moissanite
The Mumbai laboratory finds a fraudulent GIA inscription on synthetic moissanite.
Unusual Purple Fluid in Quartz
Numerous negative crystals in a pear-shaped quartz host brightly colored purple liquid.
Translucent Ruby Filled with Zinc Glass
Fissure with Moiré Pattern in Spinel
A precipitation of an unidentified mineral creates a complex moiré pattern in a fissure of a purple spinel.
.jpg "YMAL GIA Ed")
