I gather it is a custom to do such covert shielding of gems.
https://www.pinterest.com/pin/351069733450173111/
Regards,
Dave. 
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A common way to disguise precious earrings while travelling in Victorian times were so-called coach covers, golden spheres which hid the stones and were removed upon arrival.
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on January 13, 2019, 10:13 pm, in reply to "