This is a gorgeous unicorn charm stretch ring, which is a perfect gift for your unicorn mad friends or a treat for yourself. The unicorn itself is approx 11mm and the ring comes in various sizes;
XS - on average 6-9 years old
S - on average 9-12 years old
M - 12 years plus
L and XL 
n.b. not suitable for under 6 year olds