Snug, but not too tight: The ring should fit securely on the finger without being too tight. It should go over the knuckle with a little bit of resistance but not feel painful or cause discomfort. It should not leave indentations on the skin or cause redness.
Ability to twist, but not spin: When the ring is on the finger, it should be able to twist slightly, but it should not spin freely. The ring should have enough room to move, but not be so loose that it constantly spins around the finger.
Proper alignment: The ring should sit straight on the finger, with the center stone (if the ring has one) facing up and the band sitting parallel to the finger. It should not tilt or twist to one side.
Comfortable on the sides: The sides of the ring should not dig into the skin or cause discomfort. The ring should feel comfortable when the hand is at rest or in motion.
Get a professional fitting: It is recommended to have a professional jeweler measure the finger size accurately to ensure a proper fit. Factors such as finger swelling due to temperature changes, hormonal fluctuations, or other health conditions can affect ring size, so it's best to get a precise measurement from a reputable jeweler.