Inspired by the top of a Phillips screw,
Handmade machine parts.
Solid Gold! the head and the post are made of 14K Gold.
Silver version :
https://www.galbarash.com/product-page/screw-earrings-phillips
A pair of earrings.
If you want just one, Use coupon code SingleStud for 50% discount. 
Unisex.