Yes, it is polymer clay - Journals by Etsy seller MyMandarinDucky. She makes some amazing things!
Pansies and violets from polymer clay. Photo tutorial
polymer clay... i could make something like this
journal - polymer clay and glass gems
DISPLAY/ CUSTOM order owl Journal secret diary by amandarinduck, £60.00
Sculptober : Aquatic by DragonsAndBeasties on DeviantArt
Lilly picture tute