Such an old varnish (and it’s even a tester 😉 )! Another one of my vintage Diors. Nacre Lilas aka Iridescdent Lilac is a pretty sheer lilac with a visible shimmer.
Overall, it’s nice, although no longer available… but this is a shade that would fit every occasion. Shown below is three coats and I took those photos sometime around April. 😯