Dark Depths has a royal blue base filled with lots of duochrome hex glitters in various sizes, shifting from royal blue to a green-ish aqua, plus some sparkly microglitter. Sadly, the color shift is less prominent on the nail than it is in the bottle, and it's extremely camera-shy. It was hardly possible to catch the shift, only a few glitters show their green side in some of the pictures. But the shift is there, you just have to believe me (and I tried everything, from differend hand poses, different light settings to the famous bowl of water).
Application was easy, as it (almost) always is with Emily de Molly polishes. I used three coats for opacity and added one coat of Essence Better Than Gel Nails Top Sealer for a smooth finish.
Emily de Molly polishes are available on Etsy (Australia only), at Llarowe, at Shoppe Eclectico, at Mei Mei's Signatures and at Norway Nails.