Thank you Kongetro. It is so very interesting to read about this wearing of the rubies. I also suspect that the Queen was wearing the re-worked jewels of Queen Victoria.
Queen Alexandra did have some ruby jewels given to her by the Ladies of South Australia for her silver wedding anniversary, but none of the descriptions I have seen of Queen Alexandra wearing rubies after she became Queen seem to match this gift -- although there is, at least, one report when she was Princess of Wales which would explain her ruby jewels.
The South Australian gift for the silver wedding anniversary.
This news report is from 1891, long before Queen Alexandra had access to Queen Victoria's suite; yet, after she received her silver wedding anniversary gifts, so I think it may refer to her wearing the South Australian gift.