Possible Clues:

• Gems thrown out by last one standing
• Hard to get holy singles of rock
• The holy ones are the hard ones
• The holy ones make them sound bolder
• Precious ones, possibly
• Ones that are holy but hard
• Hard things to find in a graveyard
• Rock icons for 45 years (!), with 'the'
• Rollers in a saw
• Those that are holy, perhaps, and hard (6)