Doesn't jewelry seem expensive? It's so much smaller than an article of clothing, and yet it's always more expensive. You can often find nice clothes for cheap, but it's extremely rare to find nice jewelry for cheap. I don't like to wear jewelry that pretends to be expensive, because even normal people can generally see through that.
This necklace is not studded with diamonds or other gems, and it's so thick that it's obviously not made from gold. The not-found-in-nature bright blue adds a nice touch that makes it different from a normal chain necklace.