I have done some research into these jewels and I think that the second photo you show is a photoshop manipulation to show various configurations of the tiara.

When you look at the 1927 sale catalogue of these jewels the first section was retained for Russia's museums the rest of the catalogue was for actual sale. This tiara is listed as item no. 9 to be retained. Despite this it has since vanished from the jewels retained in the Russian collections like so many other pieces:

"Imperial diadem, pearls and diamonds
Regal assemblage of pearls and old diamonds. This diadem is, past question, one of the finest specimens of its kind.

Circumfrences (base) - 52cent; (top) 56 1/4 cent; central width - 12,7 cent; width (back) - 4,7 cent.

Pearls; ancient gems partly bored (some slightly damaged) - weight (as per 1898 inv): 13 pearls -33 1/4 anc. car; 42; 29; 26; 25; 24; 23; 22 1/4; 22, 19, 17 and 14 (in this lot; one round pearl and one pendant) other pearls - 3 of 39 (anc car); 2-22; 2-20; 1-9 1/4; 1-8 2/4; 2-16; 6-47; 3-17; 9-47 and 71 round pearls. Total weight 160 anc. car.

Diamonds; fine Brazilian specimens. Weight (old inv) 1 br -10 1/4 (speckled); 2 br. 2 13/16; 4 br-5 3/14; 49 br -49; 52 br - 43; 60 br 38; 172 br -54; sundry br -84 and 500

Silver setting gold lined
This diadem has been purchased during the early decades of the XIXth century.
Inv 1898, no. 215/209 inv. 1922 no. 397

Image: Plate XII photo 16 (full size)



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The only photos you see Empress Alexandra Feodorovna wearing this piece is at the 1906 Duma. Here are a few behind the scenes photos of Alexandra getting ready before leaving while wearing the tiara.