I truley believe there is no loss of sparkle with the Eco universal top coat over the crystals.
It is a really thin runny top coat so it runs down the crystals to the base and as long as the free edge is sealed with builder gel then they should stay put too. My crystals have been on 2 weeks and are still super sparkly
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When I do the set tomorrow evening I will defo let you all know if the client also thinks they stay as shiney or get even more so with the top coat & I will do my best to get pics too. I think the client is going to go with the green and silver french again (as she has had several crystal peds now).