The Post Diamond Tiara was made in the mid-19th century, set with 1,198 old mine and rose cut diamonds. Once the property of a British noble, the tiara was purchased at auction for the Smithsonian by Marjorie Merriweather Post in 1970.

Interesting that my image is much sharper on my monitor than it appears here, maybe because there is both a large and original version (with the large having been automatically resized). Perhaps looking at it in ORIGINAL would help.

Hall, İshak Paşa Sarayı, posted earlier: