Princess Alix of Hesse's engagement ring?

What do we know of Princess Alix's engagement ring? She is wearing one on her engagement finger in the photograph, which shows her hand resting on Queen Victoria's chair, but a closer examination of the sources reveals that this cannot be the official engagement ring as I outline below Tsarevich Nicholas received a ring from Princess Alix at Coburg, because he wrote in his diary for Good Friday, 15 April 1894: 'Alix gave me a ring Perhaps it is significant that the official engagement ring which Nicholas gave to Alix was pink.

It matched the necklace of pink pearls which she was given amongst the official engagement presents and the engagement ring was, according to Buxhoeveden, a 'pink pearl ring that the Empress always wore' There is no direct reference to an engagement ring at Windsor, in the primary sources Alix does refer to a ring which Queen Victoria sent her later in November 1894, for her wedding to Nicholas: 'the lovely ring I wore for the Wedding and ever since, and when I look at it I have to think of the beloved giver'.

The Tsarina does not mention her engagement ring at Ekaterinburg. . Source