And the guy stated that it wasn't solid gold because solid gold/all gold is high-priced but it was 'deep in 18k gold'
What does that mean?

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Answer:
Gold plated, wears out or peels.

Make sure you learn how to pray the Rosary, it is powerful and if you pray everyday good stuff will happens to you.

Sometimes people only pray when they're really in a bad situation, but praying the Rosary each day is when you get your prayers answered, not on that day when you REALLY need it.

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Answer:
It's gold-plated or “gold-filled”. That means there is a very thin layer of gold over another metal.