History of Famous Jewels and Collections: Queen Mary. Large oval pink topaz now worn by the Duchess of Gloucester

In December 2018 I posted an image from the Wellcome Library showing Queen Mary wearing the large oval pink topaz brooch (with a pendant) both of which are now worn by the Duchess of Gloucester as an evening jewel. See https://mb.boardhost.com/historyroyaljewels/thread/1546117414.html

Queen Mary in 1929. Photo from the Wellcome Collection.

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I have now found on the Royal Collection site (RCIN 2503011) a photo of Queen Mary in 1918 wearing the large oval pink topaz as a pendant.

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I recollect reading at some time that King George V gave Queen Mary a large pink topaz as a gift, either for her birthday or Christmas. I cannot remember where I read this -- perhaps in Pope-Hennessy's biography? Does anyone remember?

Obviously Queen Mary's collection of pink topaz jewels increased over time. It would be fascinating to track when she received each -- or should I say acquired each.