Gold appears to be “rubbing off” my 18k ring. One week of wear

This is a good ring? I've been looking around for something like this and am wondering if this is an overall good ring. : r/Diamonds

Gem Stone King 18K Yellow Gold Plated Silver Yellow Citrine and White Topaz Engagement Ring For Women (1.55 Cttw Oval 9X7MM, Gemstone Birthstone, Available In Size 5, 6, 7, 8, 9)

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高品質お手頃価格 【ALLEGE.】Silver Chain Ring - アクセサリー

Any advice for wedding bands rubbing together? I don't want to solder them because I want to be able to switch it up. : r/EngagementRings

高品質お手頃価格 【ALLEGE.】Silver Chain Ring - アクセサリー

18k white gold (supposedly), after a month of daily wear (but not in water, slept in, or gym) - should this be happening? Lots of little digs and scratches : r/EngagementRings

Gold Rings Turning Your Fingers Black - Ask Coast's Preferred Jewelers

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Duo Poppy Leaf Wedding Ring, Rose Gold Ring, Solid Gold Leaf Ring, Leaf Engagement Ring, Flower Wedding Band, Laurel Leaf, Band Gold, Gift - Canada

Is it okay to wear a gold pendant with a silver necklace? - Quora