1986 Photomicrography Competition
![Small World](/images/SW50-logo.png)
![](https://www.nikonsmallworld.com/images/photos/1986/_photo800/1986HM_03.jpg)
Honorable Mention
Thin wafer of synthetic ruby corundum (rock-forming mineral)
John I. Koivula
- Affiliation
- Gemological Institute of America
Carlsbad, California, USA
- Technique
- Polarized Light
- Magnifaction
- 40
Honorable Mention
Thin wafer of synthetic ruby corundum (rock-forming mineral)