Hi all - am looking at a beautifully cut and colored natural sapphire, but it does have a vertical feather visible through a 10x loupe (on the side, not face up). It seems fairly minor, but I know that in a diamond this is considered a flaw. Is this true in a sapphire? The dealer does not consider this a flaw in the stone, and it is priced at par with clean stones of similar color and quality. Thoughts on this?