Dear Beth, It is a very good theory.
See below my theories further to my analysis of photos :
- Queen Mary did not wear the Duchess of Teck's Collet Necklace for the coronation in 1937.
- Queen Elizabeth did not also wear her Coronation Necklace.
Consequently, I have the impression further to my analysis of photos that QM lent her longer necklace to QE.
However, I had also another theory Queen Elizabeth wore another collet (maybe from the loose crown collets kept at Garrard to vary the length of these "basic" necklaces) and Princess Marina lent The Duchess of Teck's Collet Necklace by Queen Mary.
However further to your analysis the longer diamond necklace Princess Marina wore to the coronation might have been lent to her by her sister, Princess Olga of Yugoslavia (I am not sure however).
See better photos of Princess Marina and Princess Olga wearing 4 huge collet necklaces :!!
In this photo I would say that the longer necklace is the The Duchess of Teck's Collet Necklace : this version is longer, and the diamonds have a more pronounced graduation in size from back to front.
In this photo I would say a necklace lent by her sister, Princess Olga : the diamonds seem to have the same size :
The middle one (Not sure - the gap between the 2 necklaces is not important and the diamonds are bigger) :
However in this photo I think that the longest one is the one worn by Princess Marina in 1937 :
and a bonus with 4 collets
The necklace worn by Princess Marina : the second from the bottom in this impressive photo might be the one worn by Princess Mariana with 3 other necklaces also worn on the photo just below :
Franck
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According to the press Princess Louise, Duchess of Argyll was not present at the actual coronation ceremony. She was still alive and attended the Royal Caledonian Ball some days after. Perhaps at her age she found the idea of sitting in a cold church for a long period of time too daunting.
The press noted well before the ceremony that Princess Louise was lending her coronet and robes to Princess Marina, Duchess of Kent.
24 February 1937
11 May 1937 (day before the coronation)
I don't know if Princess Louise had a diamond riviere, but I presume she would have. But what did it look like? Has anyone got an image?
I wondered if the longer diamond necklace Princess Marina wore to the coronation might have been lent to her by her sister, Princess Olga of Yugoslavia?
Princess Marina dressed for the 1937 coronation.
At the coronation Princess Olga wore the Greek ruby parure.
Group photo
Princess Olga --detail from photo above
So, if Princess Olga was not wearing her mid length riviere, it was possible she lent it to her sister.
On the following day Princess Olga attended a coronation ball in London and was photographed wearing it.
I cannot decide whether the longer length necklace worn by Princess Marina to the coronation is the same as the one worn by her sister, Princess Olga.
Below is a rough comparison I made.