source https://www.cnn.com/style/article/diamond-glasses-emerald-mughal-auction/index.html
Centuries-old Indian glasses could sell for millions
Two pairs of 17th-century glasses are expected to fetch millions of dollars at auction next month. The jewel-encrusted spectacles, which feature lenses made from diamond and emerald rather than glass, are believed to have originally belonged to royals in the Mughal Empire, which once ruled over the Indian subcontinent.
source https://www.cnn.com/style/article/diamond-glasses-emerald-mughal-auction/index.html
source https://www.cnn.com/style/article/diamond-glasses-emerald-mughal-auction/index.html