Katherine wore a cameo lapis lazuli necklace until the 1920s.
This necklace is seen in all 1864 flashbacks and in 1920s flashback. After this she wears a different necklace, then turns it into a bracelet.
This necklace is seen in all 1864 flashbacks and in 1920s flashback. After this she wears a different necklace, then turns it into a bracelet.