These are listed on the Born Pretty Store as "230Pcs/Box Newly Round Rhinestone Flat Back Acrylic UV Gel Nail Art Decoration Hot Selling Wheel". The wheel contains four different sized black iridescent rhinestones. The rhinestones are separated by size, 4mm, 3.5mm and 2mm.
The rhinestones themselves are black but they have a iridescent coating which makes them have an oil on water look to them, which is quite different. I haven't seen any like this before, usually rhinestones come in plain different colours.
I found using these studs even over a black base looked great.
For these nails I used a couple of different sized rhinestones over a black base;
Nails Inc - New York Noir
These nails were done using three of the medium size rhinestones and two larger ones as a little bit of an accent;
Nails Inc - New York Noir
I wanted to try them over a lighter colour base, as a dotticure accent nail;
Barry M - Matt White
The different size rhinestones mean you can create different looks.
Barry M - Matt White
Revlon - Steel Her Heart
Nails Inc - New York Noir
These are from BornPrettyStore, you can see some of there new products here and what is most popular here.
[item send for reviewing, this doesn't affect my views]