Opal with Agate-Like Banding
An orangy brown opal from Ethiopia displays a small patch of wavy "varve" banding, unusual for this type of gem.
Six-Rayed Star in Sapphire from Myanmar
A Burmese sapphire shows a celestial scene both externally and internally.
Type IIa Diamond with Extraordinary Etch Channels
Rare dissolution etch channels are seen in a natural diamond.
Mysterious Iridescence in Aquamarine
A rough aquamarine crystal shows an unexpected phenomenon.
Christmas Tree–Shaped Internal Feature In Diamond
A laser manufacturing remnant in a Fancy yellow diamond creates a unique specimen.
Kyanite: A Rare Blue Guest in Diamond
An unexpected crystal within a diamond helps to identify the gemstone’s geologic origin.
Cosalite in Quartz
A rare mineral is found in a rock crystal quartz host.
Quarterly Crystal: Molybdenite Phantoms in Quartz
Raman analysis identifies unusual inclusions in quartz.
Sapphires with Unusual Radial “Eye” Structure
Sapphires exhibiting radial structures are examined.
Chlorapatite in Quartz
A dichroic inclusion within a quartz crystal is found to be chlorapatite.