I am not sure if they are close friends who simply lend the tiara or if it is rented. But taking a tiara out of a safe will mean an additional insurance perhaps which can be costly.
Well, Prince Gustav and Carina live in Berleburg Castle which is only 7.5km away from Castle Schwarzenau where Prince Bernhart lives, so maybe it's the easiest and simplest way to pass the tiara if needed without much fuss.
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