At about 9 minutes and 45 seconds, the three girls are walking on the street with shopping bags, it cuts to a shot with Rikki not wearing a blue necklace, in the next shot it appears, next to cut disappears, next two shots reappears, disappears in the second to last shot and reappears for the next scene.
(at around 10 mins) When Emma, Cleo and Rikki are walking with their shopping bags, Rikki alternates between wearing a necklace and not wearing it.
When Emma, Cleo and Rikki are walking with their shopping bags, all three girls alternate between wearing and not wearing new necklaces.