London Assay Office Hallmarked Set of 5 Gold Bullion Ingots investment pieces weighing 200 grams with 3 Carats GI certificate diamonds. Each Ingot includes a unique internationally recognised London ASSAY Hallmark. Contents Luxury Cherry Oak finished box x5 Pure 999. Hallmarked Gold Bullion Ingot pieces with set of GI certificate diamonds as follows 1ct. to 0.8 0.6 0.4 0.2.