Rose quartz nails are having a moment thanks to the popularity of crystals and millennial pink.
The manicure looks like rose quartz, or the Himalayan rock salt lamp. The pale pink, marbled nails is a minimalist look that's easier to pull off than more recent trends (rainbow, unicorn, mermaid, etc.). Plus, rose quartz "provides good energy for the heart and emotional well-being."
Source: Glamour