I have no problem with them exhibiting the jewels. But the jewels should be worn as well, inbetween the exhibitions.
The ocean tiara was already exhibited twice. At first in the Grimaldi Forum, and lately by VC&A in Paris. The Cartier pearl tiara and several jewels of the late Princess Grace are regularly exhibited as well. The jewellers who made the Ocean and the Foam tiaras for Charlene were allowed to publish videos about the making of the jewels.
So obviously the princely house is very open about their jewels, they are not shy about showing them off. We just hardly ever see these beautiful pieces worn. Sigh!