1992 Photomicrography Competition

Dinosaur bone

John I. Koivula

Affiliation
Gemological Institute of America
Carlsbad, California, USA
Technique
Brightfield
Magnification
15x

Inclusions of rutile growing from a hematite core in Brazilian quartz

John I. Koivula

Affiliation
Gemological Institute of America
Carlsbad, California, USA
Technique
Darkfield
Magnification
14x