It’s not just the quality/colour of the sapphire stones, but it’s also how each sapphire can blend in with the one before and after it on the bezel. That’s the tricky part. I think individually all the stones are high quality by itself, but sometimes the gem setter isn’t able to match one stone with the rest to truly highlight the transition of colour to give it the rainbow effect. That’s why factory gem set is so rare as opposed to those backyard gem setting which just takes any coloured stones and fix them on the watch.
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