Internal Diamond Feather Inclusion Photography
Feather inclusions (Ftr) are caused by cleavage planes or internal stress fractures that have the appearance of wispy feathers. Feather inclusions are common around included crystals such as garnet, which cause internal stress fractures during crystal growth. Feather inclusions can be accompanied by internal graining and/or twinning wisp inclusions.
Feather inclusions caused by stress fractures around included garnet crystal.
Pronounced stress fractures and feather inclusions can potentially weaken the stone, making it susceptible to fracturing when exposed to thermal or physical shock. This is especially true if the fracture breeches the stone's surface, and the stress inclusion occurs along the gem's natural cleavage plane. As a result, diamonds with significant stress fractures and feather should not be cleaned in an ultrasonic cleaner as this could cause the diamond to shatter.
All of the microscopic diamond inclusion photography on this page was generously contributed by the AGSL gemological testing laboratory in Las Vegas, Nevada, and is reproduced with their permission.
Diamond feather inclusion photography by Joe Vanells, Director of Gem Services at AGSL. No reproduction without written permission from AGSL - All rights reserved.
Back To: Diamond Inclusion Library
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