I've always thought that the piece shown in Veronika's pic is the original version of the choker worn with an extender at the back and a pendant at the front.
In the past there has been some misinformation regarding the emerald necklace shown below, which has been speculated to be what is worn in Veronika's pic and/or the "original" Cambridge necklace. As I have previously posted, this piece was worn as early as 1907, years prior to the death of her brother. Roberts states that Prince Francis inherited all of his mother's emeralds, confirming my theory that this smaller necklace is not connected to the Cambridge emeralds.