1989 Photomicrography Competition
![Small World](/images/SW50-logo.png)
![](https://www.nikonsmallworld.com/images/photos/1989/_photo800/1989HM_08.jpg)
Honorable Mention
John I. Koivula
- Affiliation
- Gemological Institute of America
Carlsbad, California, USA
- Technique
Nomarski Differential Interference Contrast
- Magnifaction
- 30
Honorable Mention
Nomarski Differential Interference Contrast