Ross-Simons - .50 ct. t. w. Diamond Earring Jackets in 14kt White Gold. Stretch your accessories with this transformative pair of earring jackets! On them, .50 ct. t. w. round brilliant-cut diamonds sparkle in double halos set in polished 14kt white gold. Jackets accommodate 5.2mm round studs or best fit 1.00 ct. t. w. diamond studs, all sold separately. Diamond earring jackets. Diamond birthstones are the perfect gift for April birthdays.