Any suggestions on which size jewlers loupe to get?

[Paul in WA]

I am going to buy a jewlers loupe on eBay, but am unsure what size to get. 10X? 20X? or 30X? anyideas?

Paul

 

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[EDDE]

I have a 10x but id like a 20x

 

[killerwine]

I make jewelry and use a 10x loupe for looking at diamonds/stones...I use a 5x OptiVisor when working with my coins...HH