Sterling silver vs gold-plated vs gold-filled vs solid gold — what tarnish is chemically (silver sulfide formation), what causes it (hydrogen sulfide, sweat, perfume), and the storage protocol that doubles...
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Moissanite vs lab-grown diamond vs mined diamond compared on chemistry, refractive index, Mohs hardness, GIA grading, FTC 2018 disclosure rules, and price-per-carat. The honest buyer's guide without the jewelry-counter sales...
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