Fall is a busy time for international conferences. Not only did Gemworld host our own conference in September, but several others took place. The two covered here are conferences that the author personally participated in and so a brief summary of the topics and events is included here. CANADIAN GEMMOLOGICAL ASSOCIATION— Toronto, October 20-22, 2017 The CGA held its annual conference this year in Toronto. Generally, this conference rotates yearly between Vancouver and Toronto. Christopher Smith, president of American Gemological Laboratories, New York, USA, presented on emerald treatments. He reminded us that cedarwood oil, the seemingly oil of preference among many dealers is not a natural product. All oils are engineered. There are now so many oils and resins that can be used that he decided to categorize them into traditional and modern. The role of the lab is to communicate, not to dictate good or bad. Traditional oils include cedarwood, Canada balsam, and waxes (paraffin). Modern oils include petroleum derived such as opticon, palma oil, gematrat, excel, and permasafe. The modern fillers tend to mask fissures better as they have a higher refractive index. Colored fillers do little to improve color as one might think. Observing fillers requires overhead lighting with a loupe or microscope. Look for iridescence or a wispy appearance. Modern fillers may fluoresce but some newer ones have been engineered not to. The labs also use more....
Fall is a busy time for international conferences. Not only did Gemworld host our own conference in September, but several others took place. The two covered here are conferences that the author personally participated in and so a brief summary of the topics and events is included here. CANADIAN GEMMOLOGICAL ASSOCIATION— Toronto, October 20-22, 2017 The CGA held its annual conference this year in Toronto. Generally, this conference rotates yearly between Vancouver and Toronto. Christopher Smith, president of American Gemological Laboratories, New York, USA, presented on emerald treatments. He reminded us that cedarwood oil, the seemingly oil of preference among many dealers is not a natural product. All oils are engineered. There are now so many oils and resins that can be used that he decided to categorize them into traditional and modern. The role of the lab is to communicate, not to dictate good or bad. Traditional oils include cedarwood, Canada balsam, and waxes (paraffin). Modern oils include petroleum derived such as opticon, palma oil, gematrat, excel, and permasafe. The modern fillers tend to mask fissures better as they have a higher refractive index. Colored fillers do little to improve color as one might think. Observing fillers requires overhead lighting with a loupe or microscope. Look for iridescence or a wispy appearance. Modern fillers may fluoresce but some newer ones have been engineered not to. The labs also use more....

CANADIAN GEM CONFERENCE AND THE GEM-A CONFERENCE

Posted on January 1, 2018 by Richard B. Drucker, GIA GG, Honorary FGA

Fall is a busy time for international conferences. Not only did Gemworld host our own conference in September, but several others took place. The two covered here are conferences that the author personally participated in and so a brief summary of the topics and events is included here. CANADIAN GEMMOLOGICAL ASSOCIATION— Toronto, October 20-22, 2017 The CGA held its annual conference this year in Toronto. Generally, this conference rotates yearly between Vancouver and Toronto. Christopher Smith, president of American Gemological Laboratories, New York, USA, presented on emerald treatments. He reminded us that cedarwood oil, the seemingly oil of preference among many dealers is not a natural product. All oils are engineered. There are now so many oils and resins that can be used that he decided to categorize them into traditional and modern. The role of the lab is to communicate, not to dictate good or bad. Traditional oils include cedarwood, Canada balsam, and waxes (paraffin). Modern oils include petroleum derived such as opticon, palma oil, gematrat, excel, and permasafe. The modern fillers tend to mask fissures better as they have a higher refractive index. Colored fillers do little to improve color as one might think. Observing fillers requires overhead lighting with a loupe or microscope. Look for iridescence or a wispy appearance. Modern fillers may fluoresce but some newer ones have been engineered not to. The labs also use more....

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