padparadscha
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Beryllium Diffusion in Orange Sapphire — The Skin Game
- Date: 03-01-2022
The early history of beryllium diffusion in sapphire, starting with the 2001 appearance of large numbers of padparadscha sapphires in the Thai gem market.
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Padparadscha or Pretender — An Unusual Pink-Orange Sapphire
- Date: 06-01-2016
An orangish pink “padparadscha” sapphire was submitted for testing at Lotus Gemology’s Bangkok laboratory. Testing showed a number of conflicting features that suggested the gem was a cleverly treated synthetic pink sapphire designed to imitate natural padparadscha.
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Padparadscha Sapphire & the Ownership of Words
- Date: 06-01-2005
A discussion of the definition of padparadscha sapphire, from early to modern times, along with the difficulty in standardizing such definitions.
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Ruby & Sapphire Color Types — From Peacock to Pigeon's Blood
- Date: 04-08-2015
Rubies and sapphires occur in a variety of colors. From peacock blue to pigeon's blood red, this article looks at the color types for ruby and sapphire used at Lotus Gemology.
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Ruby, Pink Sapphire & Padparadscha — Walking the Line
- Date: 07-01-2002
An examination of the problem of separating pink sapphire and padparadscha from ruby.