sahara AT 216 opale AT 221 alessandrite AT 226 kalahari AT 217 onice AT 222 turchese bianco AT 227 gobi AT 218 zircone AT 223 calcedonio AT 228 nefud AT 219 alabastro AT 224 ametista AT 229 thar AT 220 ematite AT 225 malachite AT 230