Mysterious Iridescence in Aquamarine
A rough aquamarine crystal shows an unexpected phenomenon.
Ametrine Optical Dishes: Windows into the Effects of Crystal Structure
Optical activity is studied using a polished block of ametrine.
“Double Bubble” Multiphase Inclusion in Beryl
A “double bubble” of gas within gas appears in a 64.10 ct pale green rough beryl at room temperature.
Trapiche-Like Ruby from the Batakundi Mine, Kashmir
Trapiche-like ruby from Kashmir shows a well-formed fixed six-rayed pattern.
Sapphire Inclusion with Rutile “Silk” in a Burmese Star Sapphire
Illumination techniques reveal a remarkable sapphire inclusion within a Burmese star sapphire.
Fossil Insect in Opal
Precious opal hosts a trapped insect.
Grandidierite Inclusions in Sapphires
Grandidierite, an unusual inclusion in sapphire, independently encountered by two laboratories.
Star-Like Growth in Natural Yellow Sapphire
A natural yellow sapphire features a distinctive star-like graining pattern.
Quarterly Crystal: Orpiment in Barite
Barite cluster from Nevada hosts numerous yellow orpiment crystal inclusions.
Native Copper Inclusions in Indonesian Purple Chalcedony
Indonesian purple chalcedony containing interesting native copper inclusions is a first for the Carlsbad lab.