The original Belle Ears were released in March 2016.
A pink sequin Aurora pair of ears in a similar design (with a crown) were released at the same time in this series. While there are several other Princess ears, these are the only two released with this specific design. A Snow White and Elsa pair of ears were released around this time that also both feature a picture of the Princess (like these do).
The ears originally retailed for $24.99.