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Typically gently rub your teeth on them - if they're gritty then they're real pearl and not glass. As for the different types of pearl, I don't know

I'm no expert but I do make jewelry - this looks like the marking are purely decorative, and it appears to be silver plated brass. Is it heavy? If so it's probably brass. The front seems to show...

My 9 year old ge profile arctica fridge has been making a weird sound when it stops running for a while now - kind of a short knocking sound before a loud clunk. Is our compressor going out on us?

My hot water heater (gas & 9 years old) has been making popping/knocking sounds periodically for a while now, and just lately the water has been getting too hot. Do I need to worry?