Is glass pearl necklace and earrings set for you

I was talking to my niece and she made a statement that pearls which felt heavy were cheap, and the light pearls were better. Well I was very surprized at this as the heavier pearls in fashion jewelry are the better ones, these pearls would be knotted and have a AAA luster. These pearls go by many manufactures names but all have one thing in common, they are made of glass and are hand strung. The pearls my niece was referring to where plastice had a nice color but no substance to them and the look was not one of a nice hanging necklace. Pearls when of good quality will bring you much happiness and will wear for a long time. I have some pearls in my ebay store http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5022951766