Gems from The Mathematics Teacher - Junior 3" is a book by the Association of Mathematics Teachers of India (AMTI) that offers mathematical problems, theorems, formulas, and strategies for students. It is a part of a series designed to develop problem-solving skills and mathematical abilities for various competitive exams, including the NMTC and other olympiads. The book focuses on content for the Junior 3 level and is a valuable resource for building creative problem-solving faculties.