Another vote for horizontal; you have lovely fingers anyway and the stone looks more substantial turned 

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If it looks bigger it certainly doesn’t look big so it doesn’t matter. If you set it vertically you could always add some smaller side stones for a little more diamond “glare”.Another vote for horizontal; you have lovely fingers anyway and the stone looks more substantial turned![]()
Op please let us know what you decide!Awww, that’s very kind of you.