Journal of The Gemmological Society of Japan

Journal of The Gemmological Society of Japan

Online ISSN : 2189-8413
Print ISSN : 0385-5090
ISSN-L : 0385-5090

Search

Search
Browse

All issues

Volume 9, Issue 4

Displaying 1-13 of 13 articles from this issue

Download citation

Show all abstracts

|<
<
1
>
>|

[title in Japanese]

Article type: Cover
1982 Volume 9 Issue 4 Pages Cover1-
Published: December 15, 1982
Released on J-STAGE: January 16, 2017

DOIhttps://doi.org/10.14915/gsjapan.9.4_Cover1

JOURNAL FREE ACCESS

Download PDF (552K)
[title in Japanese]

Article type: Index
1982 Volume 9 Issue 4 Pages Toc1-
Published: December 15, 1982
Released on J-STAGE: January 16, 2017

DOIhttps://doi.org/10.14915/gsjapan.9.4_Toc1

JOURNAL FREE ACCESS

Download PDF (63K)
[title in Japanese]

Article type: Index
1982 Volume 9 Issue 4 Pages Toc2-
Published: December 15, 1982
Released on J-STAGE: January 16, 2017

DOIhttps://doi.org/10.14915/gsjapan.9.4_Toc2

JOURNAL FREE ACCESS

Download PDF (37K)
QUANTITATIVE EVALUATION OF COLOUR OF DIAMONDS BY SPECTROPHOTOMETRIC METHOD

KOJI SATO, ICHIRO SUNAGAWA

Article type: Article
1982 Volume 9 Issue 4 Pages 87-100
Published: December 15, 1982
Released on J-STAGE: January 16, 2017

DOIhttps://doi.org/10.14915/gsjapan.9.4_87

JOURNAL FREE ACCESS

Show abstractHide abstract

To evaluate quantitatively and objectively the colour of diamonds, we can adopt a new method using a spectrophotometer, instead of conventional colour grading by the naked eyes using a set of masterstones. In this new method, the chromaticity coordinate of a diamond can be obtained from the transmittance curve, which can be used for colour grading. By this procedure, it is possible to perform not only more objective colour grading but also quantitative evaluation of the effect of sizes upon colour. In the present study, the absorption coefficients (415.5 nm) of colour graded diamonds are measured and plotted on the chromaticity diagram, from which a correlation between the positions on the chromaticity diagram and the conventional colour grading scale is obtained. Calibration factors for different sizes are also obtained. Furthermore, the influences of cut proportion, fluorescence, metamerism and greyish tint upon colour grading are analysed.

View full abstract

Download PDF (1309K)
Taprovanite and Taaffeite

Ichiro Sunagawa

Article type: Article
1982 Volume 9 Issue 4 Pages 101-104
Published: December 15, 1982
Released on J-STAGE: January 16, 2017

DOIhttps://doi.org/10.14915/gsjapan.9.4_101

JOURNAL FREE ACCESS

Show abstractHide abstract

How a ruby-red cut stone was at first identified to be a new mineral, differing from taaffeite, and a new mineral name taprovanite was given, and later re-identified to be the same as taaffeite, and the name of taprovanite was discredited is desribed in this paper.

View full abstract

Download PDF (473K)
[title in Japanese]

[in Japanese]

Article type: Article
1982 Volume 9 Issue 4 Pages 105-106
Published: December 15, 1982
Released on J-STAGE: January 16, 2017

DOIhttps://doi.org/10.14915/gsjapan.9.4_105

JOURNAL FREE ACCESS

Download PDF (437K)
[title in Japanese]

[in Japanese]

Article type: Article
1982 Volume 9 Issue 4 Pages 106-107
Published: December 15, 1982
Released on J-STAGE: January 16, 2017

DOIhttps://doi.org/10.14915/gsjapan.9.4_106

JOURNAL FREE ACCESS

Download PDF (914K)
[title in Japanese]

[in Japanese]

Article type: Article
1982 Volume 9 Issue 4 Pages 107-108
Published: December 15, 1982
Released on J-STAGE: January 16, 2017

DOIhttps://doi.org/10.14915/gsjapan.9.4_107

JOURNAL FREE ACCESS

Download PDF (629K)
[title in Japanese]

[in Japanese]

Article type: Article
1982 Volume 9 Issue 4 Pages 109-110
Published: December 15, 1982
Released on J-STAGE: January 16, 2017

DOIhttps://doi.org/10.14915/gsjapan.9.4_109

JOURNAL FREE ACCESS

Download PDF (273K)
[title in Japanese]

Article type: Appendix
1982 Volume 9 Issue 4 Pages 110-
Published: December 15, 1982
Released on J-STAGE: January 16, 2017

DOIhttps://doi.org/10.14915/gsjapan.9.4_110

JOURNAL FREE ACCESS

Download PDF (84K)
[title in Japanese]

Article type: Bibliography
1982 Volume 9 Issue 4 Pages 111-119
Published: December 15, 1982
Released on J-STAGE: January 16, 2017

DOIhttps://doi.org/10.14915/gsjapan.9.4_111

JOURNAL FREE ACCESS

Download PDF (900K)
[title in Japanese]

Article type: Cover
1982 Volume 9 Issue 4 Pages Cover2-
Published: December 15, 1982
Released on J-STAGE: January 16, 2017

DOIhttps://doi.org/10.14915/gsjapan.9.4_Cover2

JOURNAL FREE ACCESS

Download PDF (1233K)
[title in Japanese]

Article type: Cover
1982 Volume 9 Issue 4 Pages Cover3-
Published: December 15, 1982
Released on J-STAGE: January 16, 2017

DOIhttps://doi.org/10.14915/gsjapan.9.4_Cover3

JOURNAL FREE ACCESS

Download PDF (1233K)

|<
<
1
>
>|

Top