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Hallmarking obscure gold karats

Hello everyone,

I am interested in using relatively high karat gold, but not 22K as this might be little soft. I want it to be at least as hard, maybe a little harder than sterling so will probably be higher than 18 but lower than 22. Probably in the range of 20-21 karat. However I fear people or even the government (I live in Canada) might not recognize these karats? What do any of you guys think?

Just my two cents, it might be hallmarked to the smaller closest standard available.