Please allow me to elaborate a bit regarding the 3 products. When I talk to Americans they think that the only silver that exists is sterling. Nothing could be more incorrect.
Silver is regulated during hundreds of years according to strict regulation and under heavy punishment – even down to boiling of people who did not apply to the regulations. The use of silver was regulated and controlled. In Denmark silver has been regulated since the 1300dreds and from 1608 a mark with 3 towers has been stamped to all silver objects – no matter how small it was. So please forget all about sterling=silver.
In the old days silver was measured in 16 parts. (Called Lødighed) – 16 lødigt is pure silver. In Denmark good silver was 13½ lod. Representing 13½ part of silver and 2½ part of copper. And please mind marked with 3 towers since 1608 – and at that time – what was USA? (Now I have made myself some enemies here)
Today silver is measured in 1.000 parts. Sterling is 925 parts of 1.000 – French silver has in periods been 950 parts of 1.000 thereby containing more silver than sterling.
German standard is 800, Norwegian is 830, Danish is 830, Swedish the same. So please bear in mind that today we do not buy silver for the contents of silver versus cobber. We buy silver for the beauty and the craftsmanship that the silversmith put in the object rather than some national standard of silver contents.
Silver objects cannot be made out of pure silver (i.e. 1.000). Silver is a soft material and it would be destroyed in use. Therefore we add copper to the silver.
To explain how - imagine that we represent 1.000 silver with a glass of milk. We have some water and the water represent copper. Take 800 ml of milk and mix it with 200 ml of water.
We now have a mixture of milk and water and we cannot separate the two liquids. That is silver partly pure silver added a material copper to make it hard. That is silver.