Sentence:  The fifth, <WSD>sardonyx</WSD>; the sixth, sardius; the seventh, chrysolyte; the eighth, beryl; the ninth, a topaz; the tenth, a chrysoprasus; the eleventh, a jacinth; the twelfth, an amethyst. 
Meaning of the word marked with <WSD> tags:  A gemstone having bands of red sard; a variety of onyx or chalcedony.