Many people are selling gold right now because it is at an all time high. With any commodity you buy low, and sell high.
It is determined by the weight and the karat of the metal.
The karat tells you how much gold is in the metal. The higher the karat, the higher the gold content.
There is usually a mark, and then tests are done with acids and/or an electronic device.
No. We buy according to weight and gold content... condition makes no difference.
It is refined and then sold back into the gold industry.
Yes. Those only appear different because of the other metals alloyed. 10k rose, white, green, and yellow gold are all worth the same.
No. The gold content is so little that to spend the cost of refining it, you would have to have a very large quanity to make it cost effective.
We can remove the stones for you free of charge if you like.
Yes. If they are 1/2 carat or bigger and of good quality.
Yes. Coins have value either as collectible coins and for the metals used to make them. We buy based on whichever is higher.