I think it is about time that some facts were established.
1. Without the research of Vincent Meylan none of us would have known what the Greville emerald tiara looked like. Initial credit must go to Vincent Meylan. His photograph and research must be acknowledged.
2. I found the first image of Mrs Greville wearing the tiara and posted various version of it on the Royal Jewels of the World Message board in July 2017.
After QEII was seen to be wearing a previously unknown emerald necklace at the Diplomatic Reception in December 2019 there was much discussion worldwide over the origin of the necklace.
On this board, Thomas was the first to do a detailed commentary with evidence that the necklace worn by QEII was most likely the one seen on Mrs Greville in the photo of the concert in 1937.
See here for the discussion on this board. https://mb.boardhost.com/historyroyaljewels/thread/1576097834.html
Not long after QEII wore the "new" emerald necklace, the staff at Polesden Lacey publicly stated that they had seen a photo of Mrs Greville wearing what they thought was the necklace, but that they could not be 100% sure.
Since then, two of us have endeavoured to find more photos of the 1937 concert. Thomas, in particular, did extensive work, contacted the National Trust staff at Polesden Lacey and identified that the photographer's archives were held by the Berlinische Galerie, and that there was a second photograph. At the time the museum's website showed only a copy of the photo which was published in 1937. See Berlinische Galerie https://sammlung-online.berlinischegalerie.de/eMP/eMuseumPlus?service=direct/1/ResultDetailView/result.inline.list.t1.collection_list.$TspTitleImageLink.link&sp=13&sp=Sartist&sp=SfieldValue&sp=0&sp=0&sp=3&sp=SdetailView&sp=124&sp=Sdetail&sp=0&sp=T&sp=0&sp=SdetailList&sp=48&sp=F&sp=Scollection&sp=l212777
Unfortunately, the pandemic intervened and communications floundered.
This year, however, the museum has placed the second photo on their website. See Berlinische Galerie https://sammlung-online.berlinischegalerie.de/eMP/eMuseumPlus?service=direct/1/ResultDetailView/result.inline.list.t1.collection_list.$TspTitleImageLink.link&sp=13&sp=Sartist&sp=SfieldValue&sp=0&sp=0&sp=3&sp=SdetailView&sp=124&sp=Sdetail&sp=0&sp=T&sp=0&sp=SdetailList&sp=72&sp=F&sp=Scollection&sp=l249595
The copyright of this belongs to the museum https://berlinischegalerie.de/en/collection/collection-online/erich-salomon-funds/
Recently the owner of a site dealing with jewels did a post presenting the two photos as a new discovery and argued they could see similar elements in Mrs Greville's necklace to the one worn by QEII in 2019. Sadly for that person members of this board had already identified the similarities. And as readers can see the second photograph does not aid us anymore than the first which was published in Bystander on 26 May 1937.
At the time of Princess Eugenie's wedding the photo I had found of Mrs Greville at the concert at the Austrian Embassy in 1937 did the rounds of the internet. Very few acknowledged the source. Even more significant was that very few acknowledged Vincent Meylan's research, which provided the basis for us all to realise that Princess Eugenie was wearing Mrs Greville's tiara.
Yet, a number of these sites are claiming copyright over their web pages.
Could I suggest that some need to do a course in what they can and cannot claim copyright over, and what is involved in intellectual property rights?