Genuinely amazing Gem Stones they've got…i purchased a Ruby from them on the internet..and it turned out very nice and was worthwhile… ” kind inclusions. If a yellow sapphire has long been heated in a large temperature these feathers are destroyed and so are quickly identifiable by a educated gemologist https://www.apsense.com/article/810029-some-historical-facts-about-sri-lankan-yellow-sapp.html