The Black Star Sapphire is black, it is a star-type stone, showing the same asterism as any "star" stone. There is no prohibition on gemstones that display asterism.
Blue is a perfectly acceptable colour, it is the colour of Sambhu, the god of the north-east (& other things).
We do not need to find an actual example of the use of a star ruby, & if an example does exist it tells us nothing except that somebody had sufficient money to pay for it.
The reality is that Jose's question taken in a literal sense cannot ever be answered because there have been millions of Balinese keris with millions & millions of different forms of ornamentation, & we cannot access every Balinese keris that ever existed.
But one thing is certain:- use of a star ruby in Balinese symbolic ornamentation is perfectly acceptable & could be used in keris ornamentation.
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