Precious and Decorative Stones

2021: No. 4 (106) CONTENTS

DOI: https://doi.org/10.53056/2021-4(106)-4

IMPROVING AND OPTIMIZING OF GEMSTONES OPTICAL MICROSCOPIC STUDIES DURING THE GEMSTONE GRADING PROCEDURE

О. Belichenko
State Gemmological Centre of Ukraine

Yu. Gayevsky
State Gemmological Centre of Ukraine

Yu. Ladzhun
State Gemmological Centre of Ukraine

K. Tatarintseva
State Gemmological Centre of Ukraine

О. Maksiuta
State Gemmological Centre of Ukraine

Language: Ukrainian

Precious and Decorative Stones. No. 4 (106), 2021: 17–20

Abstract
The article discusses the results of research work on improving gemological expertise and improving the quality of gemological education based on the implementation of clarity plots in expert and educational activities based on the results of gemstone certification based on optical microscopic studies.

Keywords: optical-microscopic studies, rubies, blue sapphires, emeralds, inclusions, gemstone certification, clarity plots, internal defects, external defects.

References

1. Gübelin E.J., Koivula J. Photoatlas of Inclusions in Gemstones. Basel. // A B C Edition. 1992. 532 p.
2. Koivula J.I. Photographing inclusions. Gems & Gemology. 1981. Vol. 17. No. 3. Fall. Р. 132–142.
3. Koivula J.I. Shadowing: A new method of image enhancement for gemological microscopy. Gems & Gemology. 1982. Vol. 18. No. 3. Fall. Р. 160–164.
4. Koivula J.I. Photomicrography for gemologists. Gems & Gemology. 2003. Vol. 39. No. 1. Spring. Р. 4–23.
5. Koivula J.I. Photographing gems. In Focus. 2007. No. 7. September. Р. 24–59.
6. Renfro N. Digital photomicrography for gemologists. Gems & Gemology. 2015. Vol. 51. No. 2. Summer. Р. 144–159.
7. Belichenko O., Gaievskyi Y., Ladzhun Y., Tatarintseva K., Maksуuta O. Different lighting techniques use in optical microscopic studies and photography of precious stone inclusions in the SGCU practice. Modern technologies and features of extraction, processing and use of natural stones: мaterials of the Х Internat. scient.-pract. conf., Kуiv, 05-06 Novemb. 2020. Kуiv, 2020. P. 7-9. [in Ukrainian]
8. Pagel-Taisen V. Diamond Grading ABC. The Manual. Publisher T.V. Kalyuzhnaya. Donetsk-Dnepropetrovsk: ART PRESS. 2008. 324 p. [in Russian]