What is referred to by 'beryl'?

Based on the clue 'bertram the count of rousillon is the hero of this...', what is the answer? Based on the clue 'bertram thomas was the first european to cross the...', what is the answer? Based on the clue 'bertramka villa in prague a museum devoted to this...', what is the answer? Based on the clue 'bertrand russell said that what galileo and newton...', what is the answer? What is referred to by 'beryllium gold'? Based on the clue 'besides 1 26 theyre the other 2 factors of the nu...', what is the answer? Based on the clue 'besides a pig it was the other animal in the title...', what is the answer? Based on the clue 'besides a young man horace greeley also told the u...', what is the answer?