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Article type: Cover
2002 Volume 23 Issue 1-4 Pages
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Article type: Index
2002 Volume 23 Issue 1-4 Pages
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Article type: Index
2002 Volume 23 Issue 1-4 Pages
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Article type: Index
2002 Volume 23 Issue 1-4 Pages
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Article type: Index
2002 Volume 23 Issue 1-4 Pages
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Article type: Index
2002 Volume 23 Issue 1-4 Pages
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Article type: Index
2002 Volume 23 Issue 1-4 Pages
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Takeshi Miyata
Article type: Article
2002 Volume 23 Issue 1-4 Pages
3-4
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Ichiro Sunagawa
Article type: Article
2002 Volume 23 Issue 1-4 Pages
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Hiroshi Komatsu, Chiyoko Suzuki, Shigetaro Ogura
Article type: Article
2002 Volume 23 Issue 1-4 Pages
5-15
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The essential beauty of pearls comes from "teri", a Japanese term to express a combined effect of luster and interference colour seen in pearls. "Teri" is not a simple equivalent to luster. "Teri" appears due to light interference from the textures of pearls. "Teri" exhibited by pale colour pearls, like Akoya pearl, appears phenomenologically opposite to that exhibited by dark colour pearls, like kurocho. How "teri" appears is theoretically analyzed for the two series, pale and dark colour pearls. Based on these analyses, optical methods combined with computer evaluation are newly designed to quantitatively evaluate "teri" of pearls in the two series.
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Hiroshi Kitawaki
Article type: Article
2002 Volume 23 Issue 1-4 Pages
16-21
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Natural amethysts from the Caxarai mine in Rondonia State, Brazil, show markedly different characteristic from those of other localities. Their <z> sectors show deeper color and quite sharp zoning than <r> sectors, and sometimes show strongly bluish pleochroism. An absorption peak in infrared region at 3543cm^<-1> which has been thought to be a clue of synthetic amethysts is seen in some of these Caxarai stones. This means that these amethysts are liable to be misidentified as synthetics when a gemologist tries to identify them by relying illogically upon the results of infrared spectrophotometry.
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[in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
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Masaki Kato
Article type: Article
2002 Volume 23 Issue 1-4 Pages
22-25
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In this paper, the mutual relation of the facing crown main facets is analyzed starting from the analyses given in previous papers. Taking the optical path inside a stone (T→T) into consideration, a fancy crown angle (incident side) is estimated by δ_1, β and (radiant side) is similarly estimated by δ_4, β. Then the incident ray and radiant ray are drawn from severally r_1, r'_1 on the fancy angles (Fig. 27). Each of Fig. 28, 29 are the radiant angle l'_4 and F-value F'_4 in the case of the facing crown facets (M→M). The ideas of the five papers are useful in planing computer graphics.
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Hiroshi Kitawaki
Article type: Article
2002 Volume 23 Issue 1-4 Pages
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Hiroshi Kitawaki
Article type: Article
2002 Volume 23 Issue 1-4 Pages
26-27
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Hiroshi Kitawaki
Article type: Article
2002 Volume 23 Issue 1-4 Pages
27-28
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Hiroshi Kitawaki
Article type: Article
2002 Volume 23 Issue 1-4 Pages
28-29
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Hiroshi Kitawaki
Article type: Article
2002 Volume 23 Issue 1-4 Pages
29-30
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Naoya Fujita
Article type: Article
2002 Volume 23 Issue 1-4 Pages
30-31
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Eiko Ito
Article type: Article
2002 Volume 23 Issue 1-4 Pages
31-34
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Eiko Ito
Article type: Article
2002 Volume 23 Issue 1-4 Pages
34-36
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Woo Deung Youh, Tomoe Sato, Rumiko Eguchi
Article type: Article
2002 Volume 23 Issue 1-4 Pages
36-38
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[in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
38-
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Article type: Bibliography
2002 Volume 23 Issue 1-4 Pages
39-55
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
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[in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
56-57
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[in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
57-58
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[in Japanese], K. Smetzer
Article type: Article
2002 Volume 23 Issue 1-4 Pages
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[in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
58-59
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
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[in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
60-
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[in Japanese], [in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
60-61
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[in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
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Article type: Article
2002 Volume 23 Issue 1-4 Pages
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[in Japanese], [in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
61-62
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[in Japanese], [in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
62-63
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Article type: Article
2002 Volume 23 Issue 1-4 Pages
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2002 Volume 23 Issue 1-4 Pages
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2002 Volume 23 Issue 1-4 Pages
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2002 Volume 23 Issue 1-4 Pages
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2002 Volume 23 Issue 1-4 Pages
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2002 Volume 23 Issue 1-4 Pages
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2002 Volume 23 Issue 1-4 Pages
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2002 Volume 23 Issue 1-4 Pages
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[in Japanese], [in Japanese]
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2002 Volume 23 Issue 1-4 Pages
66-
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
66-67
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2002 Volume 23 Issue 1-4 Pages
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Article type: Article
2002 Volume 23 Issue 1-4 Pages
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[in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
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[in Japanese], [in Japanese]
Article type: Article
2002 Volume 23 Issue 1-4 Pages
68-69
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