I have got this coin, 1 oz lunar dog 2006, weighs 31,90 grams, one ounce should be around 31,10 grams, is this normal?
I really don't mean to insult you but you weighed the coin without the case right? I just have to ask
Maybe your scale is a little bit off. Unless you bought it from a seller from China my guess would be that it's fine.
The corresponding (identical) design 1-ounce silver for 1999, Year of the Rabbit, KM# 502, weighs 31.64 grams. That's the only direct comparable I can find. Is the edge of your coin reeded, lettered, or plain?
Tried with a silver eagle, perfect 1 oz, I don't think it's the scale. Edge is reeded. You are right about the 31,64 grams, just read about that online, so these lunar ounces are 31,64 grams: "The first one ounce silver lunar was issued in 1999 by the Perth Mint, all Silver Lunar Coins have a $1 face value to them and have a silver purity of .999, and each coin weighs 31.63 grams or one ounce."
Does not stick to a regular magnet. No rare earth magnet for slide test, nor a caliper for thickness and diamater.
You are mixing up the weight of the coin vs. the weight of the silver: 1 troy ounce = 31.1034768 grams. If it's only .999 silver, there must be "something else," however small. edited - sorry, I was interrupted four times while writing this post, so forget my calculations.
I think you meant 31.103 grams of silver and 0.497 grams of something else (how could there be something else since it's 999 silver?).
Some of the Engelhard Prospector rounds I bought from Apmex weighed in at 31.2 grams. I wouldn't worry about a tenth of a gram variance. Edit: I realize the OP is talking about eight-tenths now. That is quite a lot, actually.
Yes, 8 tenths is a lot, still haven't figured how an ounce of silver weighs 31,64 grams in Australia but the coin is real that's what matters. Got it in a lot with other coins from a reputable seller, they are all legit.