RE: [Demo notebook] QC clinic: photographic evidence and its limits · RWI-01369

Case 48 — Crystal types: sapphire, mineral and acrylic trade-offs for daily wear · source wording exercise

Reader check for “Crystal types: sapphire, mineral and acrylic trade-offs for daily wear”: distinguish the discussion point “Sapphire is very hard to scratch but can chip or crack…” from its proposed application. The thread offers a way to reason about the question, without adding a personal experience or a newly observed outcome. Review focus: source wording. Retain the source wording beside any paraphrase.