EDIT:

Sash Giles
Curator of Decorative Arts
Devonshire Collections
Chatsworth

Is the researcher who discovered that the necklace/tiara contains black opals, and must be credited for this.



A very warm welcome altezania Mompox, I dont think I had the pleasure of meeting you before, hope u like our little space here. The information you have provided adds to the mystery as I thought the stones were identified as sapphires.

Regards,

Dave.