Radiance Studs Pink QuartzSparkle and shine with our all time best selling studs. Dress them up or dress them down, these will go with everything. They are a must have staple item. These have sterling silver post and backing. Care: These earrings will last as long as you take proper care. Your gems need to be kept safe and dry, away from any moisture and stored out of sunlight. Each gem is delicately placed into the clay base and moisture can affect the integrity of the clay.