The term 'RING THING' can be broken down into three crossword solutions: GEM (3 letters), GEMSTONE (8 letters), and STONE (5 letters). GEM is a precious or semi-precious STONE that is cut and polished for use in jewelry. A GEMSTONE is a type of GEM, usually a mineral, that is cut and polished for use in jewelry. STONE is a naturally occurring solid aggregate of minerals or mineraloids. All three of these words refer to materials used to make rings, hence the term 'RING THING'.