HERE'S AN ALL NATURAL, HEART SHAPED , ( 45 X 35 mm. ) MOOKAITE GEMSTONE FROM AUSTRALIA THAT WILL BE MADE INTO A BEAUTIFUL NECKLACE BY HANDCRAFTING A HOOK CLASP ON A BLACK LEATHER CORD WITH YOUR CHOICE OF EITHER 14-KT. ROLLED GOLD OR .925 ( ARGENTIUM ) STERLING SILVER. THIS GEMSTONE WEIGHS 85 CARATS AND HAS A MOHS HARDNESS OF 6-7 .