A discussion of how inclusion patterns mimic crystallographic symmetry in ruby and sapphire.
The history of glass-infilling in blue sapphire, along with a description of the latest treatment generation developed in Chanthaburi, Thailand.
A discussion of rutile silk in corundum and its use in detecting artificial heat treatment. Careful examination of these "silk" inclusions can provide vital clues to unmask heated gems.
Introducing the blue filter as a gemological tool to separate natural and Verneuil synthetic yellow sapphires.
The history of Burma's jade mines, as seen through Western eyes, from the earliest accounts through World War II.