A ( 40 X 27 X 8 mm. ) ALL NATURAL DESIGNER SHAPED MALACHITE GEMSTONE FROM THE CONGO THAT WILL BE MADE INTO A BEAUTIFUL NECKLACE BY HANDCRAFTING A HOOK CLASP ON A LIGHT GREEN LEATHER CORD WITH YOUR CHOICE OF EITHER 14-KT. ROLLED GOLD OR .925 ( ARGENTIUM ) STERLING SILVER. THIS GEMSTONE WEIGHS 130 CARATS AND HAS A MOHS HARDNESS OF 4 .