Queen Emina of Egypt's Diamond Necklace Tiara

Creation: This tiara can be worn as a necklace and was made in the mid-1800s using diamonds given from Empress Catherine the Great to Sultan Ahmed III as a peace offering in 1711.

Materials: multi-colored diamonds set in silver and gold

Princess Neslisah

Princess Neslisah

Princess Neslisah

Provenance:

1. Queen (Khediva) Emina of Egypt née Princess Emina Ilhamy Nacibe Hanimefendi; from Sultan Abdul Hamid II of the Ottoman Empire possibly on the occasion of the birth of her oldest son in 1874
2. King (Khedive) Abbas II of Egypt; from his mother
3. Princess Neslişah of Egypt née Princess Fatma Neslişah Sultan of the Ottoman Empire; from her father-in-law on the occasion of her 1940 marriage to Prince Muhammad Abdel Moneim
4. Unknown Owner; bought at auction at Christie's in 1963 for £12,500

Princess Neslisah

Princess Neslisah

Questions: 

• Which jeweler created this tiara?
• Who currently owns this tiara?
• Are there any photos of this tiara being worn prior to Princess Neslisah?
• The tiara was put up for auction at Sotheby's in 2011 and in 2016.  Was it  successfully sold either time?

Links: 

• Sotheby's - A Superb Suite of Imperial Jewels, A Magnificent and Unique Diamond Parure, Mid 19th Century
• Sotheby's - Impressive diamond parure, late 19th century