Aside from the paper ring size chart, one of the most accurate at-home sizing methods is a ring sizer. Ring sizers can be found online for as cheap as $4. The process is quite simple: "you feed one end through the other like a loop," said Seetal Jogia, founder of Labyrinth Diamonds. "The calibrated gauging system (with all the numerical values) is placed on the finger and tightened to a certain amount to see how easy and difficult it is to move it back and forth."
Experts suggest taking a few measurements throughout the day to see if there is any fluctuation. "We tend to retain water differently — some people more than others, whereas some people are more sensitive to external parameters. Generally speaking, the afternoon is the best time to measure as the body is at an equilibrium and room temperature," Jogia said.
There is a myth that you should measure your ring size using floss or a thin string, but Jennie Yoon, founder and designer at Kinn, urges clients not to use that method. "The majority of pieces, especially engagement rings (at 1.5 mm), are thicker than floss, so the measurement wouldn't be accurate," she said.
