Have I correctly constructed this sentence using 'far stronger than the strongest stone,' 'shines forth,' and 'brilliance'?

RommelHave I correctly constructed this sentence using 'far stronger than the strongest stone,' 'shines forth,' and 'brilliance'?

Yes.

RommelIs there anything wrong with this sentence?

The reader may question whether a stone can shine like a star. To me the sentence appears to contain a "mixed metaphor problem".

CJ

The sentence is grammatically correct. For me personally, the application of the metaphor does not seem entirely consistent. The references to shining and brilliance make me think of a gemstone. On the other hand, the reference to strength makes me think of something like granite, for example.

(Cross-posted with Calif Jim.)

Would it be acceptable if I wrote ...stone that glitters like a...star? Is glitter a better word to use instead of shine?

If I rewrite the sentence as follows, will it be acceptable?

My best friend wants me to be far harder than a gemstone that shines forth like a one-of-a-kind star, the brilliance of which I can call my own.
My best friend wants me to be far harder than a gemstone that shines forth like a one-of-a-kind star with awesome brilliance I ca

RommelIs glitter a better word to use instead of shine?

Yes, but as already mentioned, strength and shining (or glittering) don't seem to go together well.

CJ

RommelIf I rewrite the sentence as follows, will it be acceptable?

My personal taste is such that "awesome" doesn't work for me, so the first sentence of the two seems better to me.

All of your sentences so far are rather long and flowery, but that's a matter of style. There's nothing wrong with the grammar.

CJ