Cartier Ring Sizing Help

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Hello all. I am purchasing the Cartier love ring in the 5.5 mm. I am not near a boutique. I am a true size 10 on my right middle finger. This was confirmed by a measuring ring at James Avery. I also tried on a very wide ring (almost 1 cm) and could easily do a 10.5 in James Avery. My question is, if I am a true size 10, do I need to size up at all since I am wanting the 5.5mm love band.

Thank you in advance!
 
Hi! I got myself a love wedding ring in YG, to wear on my middle finger, right hand. I got size 54 at the boutique, but when I got home it was a little loose, slide up and down under knuckle easily. Maybe because it was cold that day?
So I went back and got size 53. It fits perfectly, it’s snugged but it leaves indent on my finger slightly. It does stay in one place though. Should I go back again and size up? I live in LA, I don’t know how it’s like in the summer.
 
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