R
Richard W. Wise
Guest
Not sure where this should go but here it is. Would very much like to hear from Pearl people about their views of lighting.
Lighting and Grading Gemstones Part II
LIGHT UP YOUR LIFE
by Richard W. Wise, G.G.
? 2006
What is the best lighting environment to view gemstones? In part I of this post I discussed the various lighting options and the pros and cons of each. In part II I will write about the lighting some of the world?s foremost gem experts and connoisseurs choose to both view and evaluate gemstones.
Among the experts opinions differ somewhat as to which ?daylight? Kelvin temperature is best but each accepts daylight as the standard. Stephen Hofer one of the world?s most respected authorities on colored diamonds, maintains that 5500K works best for colored stones and 6500K is best for diamonds both white and colored. In his lab, which is dedicated to the evaluation of fancy color diamonds, all grading work is done under 6500 Kelvin fluorescents. C. R. Beesley, President of American Gem Labs in New York, prefers Vitalite a bulb manufactured by The Duro-Test Corporation with a Kelvin rating of 5500. "Most people don't do their homework", says Beesley, "comparing color temperature isn't enough..." Beesley tested more than twenty different light sources in the process of developing his Colorscan colored stone grading system to gauge their actual effect on gemstones. READ ON my blog: GemWise: www.gemwiseblogspotcom.blogspot.com link below:
Lighting and Grading Gemstones Part II
LIGHT UP YOUR LIFE
by Richard W. Wise, G.G.
? 2006
What is the best lighting environment to view gemstones? In part I of this post I discussed the various lighting options and the pros and cons of each. In part II I will write about the lighting some of the world?s foremost gem experts and connoisseurs choose to both view and evaluate gemstones.
Among the experts opinions differ somewhat as to which ?daylight? Kelvin temperature is best but each accepts daylight as the standard. Stephen Hofer one of the world?s most respected authorities on colored diamonds, maintains that 5500K works best for colored stones and 6500K is best for diamonds both white and colored. In his lab, which is dedicated to the evaluation of fancy color diamonds, all grading work is done under 6500 Kelvin fluorescents. C. R. Beesley, President of American Gem Labs in New York, prefers Vitalite a bulb manufactured by The Duro-Test Corporation with a Kelvin rating of 5500. "Most people don't do their homework", says Beesley, "comparing color temperature isn't enough..." Beesley tested more than twenty different light sources in the process of developing his Colorscan colored stone grading system to gauge their actual effect on gemstones. READ ON my blog: GemWise: www.gemwiseblogspotcom.blogspot.com link below:
