silk Directory References Discover 12 Novels Considered the “Greatest Book Ever Written” 6 Wars of Independence Will Light-Speed Space Travel Ever Be Possible? Nostradamus and His Prophecies 12 Greek Gods and Goddesses What Do Eggs Have to Do with Easter? Why Is Ireland Two Countries? Contents Ask the Chatbot a Question silk in sapphires Ask the Chatbot a Question Learn about this topic in these articles:result of sapphire inclusions In sapphire…faint whitish sheen, known as silk. Tiny, regularly arranged mineral inclusions (commonly rutile) and elongate cavities are responsible for the asterism shown by star sapphire.Read More Britannica ChatbotChatbot answers are created from Britannica articles using AI. This is a beta feature. AI answers may contain errors. Please verify important information using Britannica articles. About Britannica AI.