There are not enough uses for purple gems and they end up just collecting unnecessarily. It's very frustrating to continually be awarded gems you know you won't be able to use. Please either lessen the frequency with which they are awarded or provide more uses for them, either in boosters or at the zoo. If you decide to add more uses for them, please do not require those uses to need a lot of other gems since there are already plenty of things requiring other gems, especially orange ones. For example, a new booster would ideally use a majority of purple gems and only a couple of the other colors.
Thanks.