Hi, I just got a ring back from the assay office and the form it came back with states it's 925 silver. But I made it with PMC3, which I was told would be 999. The only parts of the ring that are sterling silver are the (buried) mounts. When I fired it, they were the only parts that flamed green. So what did I do wrong? I really needed it to be hallmarked as fine silver because that's what the commission was for.

I can't actually check the hallmark itself, I don't have the optical equipment. I'm guessing the assay office takes the lowest quality component and hallmarks it as that? Although the ring is 6.6 grams of PMC silver. Argh! Any advice welcome!