Gold-filled vs 14k gold vs sterling silver: what you're paying for
Gold-filled, 14k gold and sterling silver are not the same thing at different prices. Each is made differently, so each wears differently. Here is what you are paying for.
14k gold: gold all the way through
14k gold is hallmarked 14k: 58.5% gold, the everyday standard for fine jewelry. Yellow and rose 14k are the same colour all the way through, so there is no layer to wear off, and gold does not tarnish. White gold is usually rhodium-plated for its bright white; that plating wears with time and a jeweller can renew it.
How it wears: scratches soften over time into a satin glow. Gold is a soft metal and can dent, so take it off for the gym. For comparison, 10k (41.7% gold) is the toughest karat and 18k (75% gold) the softest.
18k gold-filled: a thick gold layer
Gold-filled is a thick gold layer pressure-bonded over a base metal core. It is not solid gold, but the gold layer is far thicker than a plating or a laminate. The core alloy is not declared, so we cannot promise it is nickel-free.
How it wears: it is made for everyday wear and holds its colour for years with basic care. It will not flake or turn your skin green the way a thin plating can. Washing your hands is fine; take it off for the pool, the hot tub and the beach, because chlorine and salt are hard on it. If it dulls from skin oils, a wipe with a soft cloth brings it back.
Sterling silver 925: bright, and it changes
Sterling silver is hallmarked 925: 92.5% silver with a little copper.
How it wears: silver darkens over time, and a polish brings it back bright. Chlorine and sulphur darken it faster, so keep it away from the pool and store it in a closed pouch.
Which one is for you
If you want a piece that does not tarnish and has no layer to wear off, 14k gold. If you want the look of gold for everyday wear and are happy to take it off for the pool and the beach, gold-filled. If you love a bright white metal and do not mind a polish now and then, sterling silver.
Whichever you choose, the same habits keep it looking good: put it on last, take it off first, keep it dry, and store it in its pouch.