Nikon Small World - Gallery - 19th Place, 1986 - John I. Koivula

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19^th Place, 1986

John I. Koivula

Gemological Institute of America
Santa Monica, California, USA

Australian yowah nut opal concentration (15x)

Brightfield

The 1986 Winners

1^st Stephen Lowry
2^nd Arthur Strange
3^rd George Watchmaker
4^th Edward Manley
5^th John Koivula
6^th William Schadel
7^th Paul Fry
8^th Roland Marsh
9^th Charles Noasch
10^th Michael Klein
11^th Gordon Lee
12^th L. Poon
13^th Avinoam Tomar
14^th Dennis Kunkel
15^th $Fresnel zone plates: defraction gradient on silica$ George Watchmaker
16^th Lanier Rowan
17^th Avinoam Tomar
18^th Arthur Strange
19^th John Koivula
20^th J. Ma Bermejo Garcia

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