What is the 60th wedding anniversary?

This is what is written in the etiquette book, it must be right. The first year paper wedding, the second year cotton wedding, the third year leather wedding, the fourth year flower and fruit wedding, the fifth year wood wedding, the sixth year sugar wedding Year 7 Wool Wedding, Year 8 Bronze Wedding, Year 9 Pottery Wedding, Year 10 Tin Wedding, Year 11 Steel Wedding, Year 12 Silk Wedding, Year 13 Lace Wedding, Year 14 Ivory Wedding, Year 15 Crystal Wedding, Year 20 Porcelain Wedding 25 years of silver wedding, 30 year of pearl wedding, 35 year of coral wedding, 40 year of ruby ??wedding, 45 year of sapphire wedding, 50 year of golden wedding, 55 year of emerald wedding, 60 year of diamond wedding