RE: [Demo notebook] Workbench questions: what to record before asking for service · RWI-20963
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Case 38 — Crystal types: sapphire, mineral and acrylic trade-offs for daily wear · source wording exercise
Spec sheets list sapphire, mineral or acrylic crystals, and opinions in threads are very strong. For a daily-wear watch, what are the real trade-offs, and is an anti-reflective coating worth paying for?
Review focus: source wording. Retain the source wording beside any paraphrase. Use the original answer fragment “Sapphire is very hard to scratch but can chip or crack…” as the discussion anchor; no new event or result is supplied.
Exercise RWI-20963/38: address this question within its stated limits.