5.56 Emerald Cut Ametrine Stud Earrings in 14k Yellow Gold5. 56 Emerald Cut Ametrine Stud Earrings in 14k Yellow Gold. These modern stud earrings feature two 2. 78 carat natural ametrine gems in 14k yellow gold. The ametrine stones have a gradient color that morphs from golden yellow into lilac purple. Set in four 14k yellow gold prongs, each Emerald Cut ametrine has elongated, rectangular facets that create a hall of mirrors for light to bounce around the stones. These colorful studs would make a terrific