Sudarat Saeseaw

Sudarat Saeseaw
  • MAster degree of Analytical Chemistry, G.G., FGA
  • Manager at Gemological Institute of America

About

26
Publications
70,275
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328
Citations
Current institution
Gemological Institute of America
Current position
  • Manager

Publications

Publications (26)
Article
Full-text available
Thailand has been a leader in the global corundum trade since the 1950s. Bangkok and Chanthaburi remain important treatment and trading centers even though many—though not all—of the country’s corundum deposits are nearly exhausted. Since the early 2000s, there’s been a small-scale mining revival in Thailand’s Chanthaburi province. Chanthaburi’s sa...
Technical Report
Full-text available
Forty faceted rubies which were submitted to the GIA Bangkok and Hong Kong laboratories were examined. The stones ranged from 1.20 to 4.48 carats. Standard gemological testing was carried out using the OPL hand held spectroscope to establish that the material was ruby. Internal features were observed using a variety of Gemolite microscopes with mag...
Article
Full-text available
Recently (May 2015) several unusual looking faceted spinels were submitted to GIA’s New York, Carlsbad, and Bangkok identification laboratories. At the same time and within the social media it was announced by GRS Laboratory that Mr. M.T.M Harris of Emteem Gem Laboratory had reported seeing similar stones coming through his laboratory in Beruwela,...
Technical Report
Full-text available
Since 2009, Mozambique has become the world’s leading source of commercial and gem-quality ruby. While many gems from this country are subject to “conventional” high-temperature heating (1300oC, or 2,372oF), rumors have been circulating within the gem trade that many rubies might be treated in Sri Lanka at much lower temperatures. With red to pink...
Article
Full-text available
The emeralds from the new deposit near Musakashi in Zambia presents some very interesting characteristics but also remains quite mysterious becauseof the legal issues between the people owning the mining licenses in the area that stopped the production of the main mine five years ago. Now, on the positive side, the location of the deposit is great:...
Article
Full-text available
Until now, the observation of three-phase inclusions in emeralds has been considered a potential indicator of Colombian origin. Nevertheless, emeralds from Afghanistan (Panjshir Valley), China (Davdar), and Zambia (Kafubu and a new deposit at Musakashi) may contain three-phase inclusions resembling those often found in specimens from Colombian depo...
Article
Full-text available
The fascinating and colorful history of natural pearling in Australian waters is presented, from the early six-man luggers to the large ships in modern fleets where pearl culture has been the focus for the past several decades. For the scientific investigation of this paper, the authors retrieved natural pearls from wild Pinctada maxima in Australi...
Article
Full-text available
The fascinating and colorful history of natural pearling in Australian waters is presented, from the early six-man luggers to the large ships in modern fleets where pearl culture has been the focus for the past several decades. For the scientific investigation of this paper, the authors retrieved natural pearls from wild Pinctada maxima in Australi...
Article
Full-text available
After the discovery of the Montepuez ruby mining area in Mozambique, during spring 2009 (Pardieu, et al., 2009a), within few months, gemologists at the GIA Laboratory Bangkok started to see many stones originating from this new deposit. Many unheated stones were submitted for examination, but this was quickly followed by material that had been heat...
Article
Full-text available
In April 2009 several unusual purple sapphires were submitted to the GIA Laboratory Bangkok for examination by Mr Zulfiqar Ali Abbas from “Kashmir Gems”, Ltd (Pakistan). The stones were reported to have been mined in Kashmir near the villages of Batakundi and Basil located reportedly in Pakistan controlled Kashmir. This study focuses on the gemolo...
Article
Sedimentation field-flow fractionation (SdFFF) was applied in order to characterize particle sizes of beta-lactoglobulin aggregates induced by Ca2+ or Zn2+. Aggregation induced by Zn2+ was faster than that induced by Ca2+. Effects of Zn2+ and beta-lactoglobulin concentrations, as well as contact time, on the aggregation of beta-lactoglobulin were e...
Article
Sedimentation field-flow fractionation (SdFFF) was applied to characterize particle size distributions of food materials. Two types of food particles were examined, including milk suspensions and flour samples. Milk eluted in the normal mode SdFFF, whereas the steric mode of retention was used for flour samples. Various types of milk being investig...
Article
Full-text available
Natural spinels are found in colors equal to those of fine rubies or sapphires, and since top quality spinels are one of the few 'better known' gems to have so far escaped the attention of large scale treatment processes; they are gaining a greater commercial importance. However, it would appear that at least some heat treated natural spinels are o...

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