The outer diameter is approximately 7.5 mm and the width / length of 4.8 mm.
The bead is thus the diametrically smaller than many of the full-size silver / gold Pandora beads, so it threatens gaining access to spaces and disappear (depending on Nachbarbeads it comes but just barely).
For me personally it is (now) actually rather too small; I should return it better yet.
The bead carries the 925 ale stamp.
Oh, you should still know that Amazon (herself) the Pandora beads usually shipped in small plastic bags that say "Made in Thailand", etc. stands. So without a gift / jewelry box! This makes Amazon but always so, even with expensive gold beads, so it has nothing to do with the price or the question "Real or not real" to do. If you want to have a gift / jewelry box, you should at a Pandora local dealer or one of the suppliers buy here that explicitly promise - or you buy or tinkering itself a beautiful jewelry box.