Board Thread:Ask the Staff/@comment-26457227-20150624171946/@comment-508329-20150627085211

Yep. Garnet's gems are both red in season 1 and purple in season 2. Malachite's gems are green. Sugilite's gems are all pink. Alexandrite's gems are all a mixture of red and green depending on how the light hits them.

The colours on Pearl's gemstone look kind of weird because she's the only member of the Crystal Gems who has a cabochon gemstone instead of a faceted gemstone.