ALL NATURAL UNHEATED UNTREATED LAPIS LAZULI. Lapis Lazuli. LAPIS WEIGHT PCS 6 / 28.58 CTS. 1.493 GRAM 18K YELLOW GOLD. 8.517 GRAM 925 STERLING SILVER. STUDDED IN 925 STERLING SILVER. DIAMOND CUT – PCS 14 / 0.22CTS.