Tanzanite and Diamond Studded Earrings in 18karat White Gold For Sale Set in 18K Gold, 9.24 carats Tanzanite, Black Onyx and Diamonds Stud Tanzanite and Diamond Studded Earrings in 18karat White Gold For Sale Tanzanite and Diamond Earring Studs in 18 Karat White Gold For Sale at. Based in solid 18 karat gold, these colorful stud earrings top their emerald cut blue topazes with smaller tanzanite stones. Pav set diamond halos create ambient shimmer. From Goshwara's Gossip Collection. Post back closure 18k yellow gold, blue topaz, tanzanite and diamond Carat: 0. 42 ctw diamond, 1. 9 ctw tanzanite, 8. 21 ctw topaz Polish with soft cloth Made in India If you would like to consult with a fine jewelry expert, please email us at jewelryconcierge@olivela. com.