Extremely sturdy content, greatest for gem security (prongs tend not to bend or break very easily) Could be highly-priced ” sort inclusions. If a yellow sapphire continues to be heated at a significant temperature these feathers are ruined and therefore are conveniently identifiable by a skilled gemologist , even in https://www.apsense.com/article/810029-some-historical-facts-about-sri-lankan-yellow-sapp.html