Historical clue formulations

• Ring around a watch face — 2018-10-24
• Part of a watch that holds the face's glass cover — 2017-06-03
• Grooved ring on many a ring — 2012-03-24
• Watch-crystal holder — 2008-02-17
• Gem holder — 2007-01-30
• Diagonal face of a chisel — 2002-09-17
• Automobile headlight holder — 1997-12-12
• Rim that holds a gem — 1997-02-05
• Ring holding a watch crystal — 1996-07-10
• Groove holding a gem in place — 1994-05-14