Compared to the large sapphire dome in the original Astronomia, the new case on the 2015 model has been slightly reimagined. There are smaller sapphire crystal areas (which are now split into a row of windows and one large one at the top) with the added addition of metal to create a more palatable and more wearable design. Jacob & Co. Astronomia Tourbillon have a case size of 50 x 25 mm. The case is made of 18k rose gold, there is a version with and without diamonds.