Biggs jasper
... that Biggs jasper is one of the most sought-after extremely siliceous gemstones?
... that <b id="mwARs"><a href="./Biggs_jasper" id="mwARw" rel="mw:WikiLink" title="Biggs jasper">Biggs jasper</a></b> is one of the most sought-after extremely <a href="./Silicon_dioxide" id="mwAR0" rel="mw:WikiLink" title="Silicon dioxide">siliceous</a> gemstones?