@estellacollection: This bumblebee stud is created in a bright 14k gold, and glistens with a sparkling cubic zirconia in the center, adding a touch of shine.Stone Details: Cubic ZirconiaColor €“ ClearShape €“ RoundMaterial: 14k Solid Yellow GoldFlat Back Thickness:1.0mm | Flat Back length 5mm: Small, 6.5mm: Standard, 8mm: Medium, 10mm: Large*All of our flat backs are internally threaded.