Bernd, thanks for your feedback. I agree it does look somewhat similar. I've been going back & forth on this and a lot of time so I am confident that it is not a sapphire version Cartouche 23. The pattern on 23 is a different motif than this one. This has unique "dots" on each side between the scrolls. 23 also lacks the distinct "pentagon" border around the stones like Cartouche 24 has on it, as mine does.
For now I'm going with; I have yet to see an exact match. So many seemingly missing Cartouche entries....