I have ordered the thin 5mm band and the 10mm (both bought in two different sizes for each hand after getting them) and the thicker the band (mm size) sometimes being jade different sizes may or may not fit so I sized up one size as this band is thick like the 10mm band. (The 5mm was true to size if you wear a gold ring order same size, if anything larger in width I would bump it a half a size up or 1 to make sure it is comfortable on your hand, but that is solely based on my experience as I don’t like overly tight rings). THIS IS MY FAVORITE RING BY FAR!!! That I ordered it is also darker than my 10mm and similar in being a darker shade of Nephrite which I love. It is smooth high polish finish and great for someone who fidgets and twirls rings and if you size up a bit as I did you can wear it on more than one finger. LOVE IT LOVE IT and like the other two rings when I am able I am going to order a 2nd one of this ring as well because I love it so much its a great ring finger, middle finger and index finger ring. Highly recommend esp since other nephrite rings may or may not be so dark because this is chunkier but when held to light or loop you can see the variations…..Again highly recommend