Identification of “Pistachio” Coloured Pearls Treated by Ballerina Pearl Co.
A report on the colour treatment process for these intensely greenish yellow to yellowish-green cultured pearls and the techniques for identifying them.
The Colour Durability of “Chocolate Pearls” by Ballerina Pearl Co.
Colour-treated brown Tahitian cultured pearls, known in the trade as “Chocolate Pearls”, have become increasingly prevalent in the market.
Update on the Identification of Treated “Golden” South Sea Cultured Pearls
This study demonstrates how atypical absorption features, particularly in the blue region of the spectrum, can be used to positively identify colour treatment.
Identification of “Chocolate Pearls” Treated by Ballerina Pearl Co.
Treated cultured pearls with a “chocolate” colouration have entered the market from several sources.
The Pearl in the Chicken: Pearl Recipes in Papyrus Holmiensis
Several pearl-in-chicken cleaning experiments are carried out to test the validity of recipes from an ancient Egyptian source.