{"references":[{"id":"tz-mining-commission-imperial-topaz-2026-04","publisher":"Tanzania Mining Commission","title":"Coloured Gemstones Price Guide","edition":"2026-04","page":12,"item":83,"material":"Imperial Topaz","grade":"GOOD TO FINE","form":"CUT AND POLISHED","unit":"USD_PER_CARAT","status":"DOCUMENT_VERIFIED","role":"EXTERNAL_INDICATIVE_REFERENCE","included_in_index":false,"iti_category_mapping":null,"source_url":"https://www.tumemadini.go.tz/media/uploads/quarterly_prices/colored_gemstones/2026/05/29/MINING_COMMISSION_COLOURED_GEMSTON_bZaX56u.pdf","sha256":"d94a0a5eef65b358647f9fe37704d7af182e7c4c4d898ed7c70b3af4339ea375","verification":"Visual check of page 12 and text extraction of user-provided PDF; this verifies transcription, not current market validity.","rows":[{"weight_ct_as_published":"0.50 - 0.99","A":"78","B":"30","C":"6"},{"weight_ct_as_published":"1.00 - 2.99","A":"310","B":"52","C":"9"},{"weight_ct_as_published":"3.00 - 4.99","A":"429","B":"130","C":"15"},{"weight_ct_as_published":"5.00 - 9.99","A":"494","B":"142","C":"24"},{"weight_ct_as_published":"+10.00","A":"+528","B":"+147","C":"+30"}]}],"scope":"EXTERNAL_COMPARISON_ONLY","price_effect":"NONE"}