3 0 ▁y acht ▁of ▁the ▁J ▁Class ▁and ▁successful ▁def ender ▁of ▁the ▁ 1 9 3 0 ▁America ' s ▁Cup . ▁It ▁was ▁ordered ▁by ▁Harold ▁V ander b ilt ▁and ▁designed ▁by ▁Star ling ▁Burg ess . ▁Enter prise ▁was ▁scra pped ▁in ▁ 1 9 3 5 . ▁ ▁References ▁ ▁Category : J - class ▁y ach ts ▁Category : America ' s ▁Cup ▁def enders ▁Category : S ail ing ▁y ach ts ▁designed ▁by ▁William ▁Star ling ▁Burg ess ▁Category : 1 9 3 0 s ▁sail ing ▁y ach ts <0x0A> </s> ▁In ▁popular ▁culture , ▁sets ▁of ▁pre cious ▁subst ances ▁may ▁form ▁hier arch ies ▁which ▁express ▁conventional ▁perce ived ▁relative ▁value ▁or ▁mer it . ▁P reci ous ▁met als ▁appear ▁prom in ently ▁in ▁such ▁hier arch ies , ▁but ▁as ▁they ▁grow , ▁g ems ▁and ▁semi - pre cious ▁materials ▁may ▁be ▁introduced ▁as ▁part ▁of ▁the ▁system . ▁The ▁sequences ▁can ▁provide ▁interesting ▁examples ▁of ▁the ▁arbitr ar iness ▁of ▁semi otic ▁signs . ▁ ▁Trad itional ▁manifest ations ▁J ub ile es ▁have ▁a ▁hierarchy ▁of ▁years : ▁silver ▁( 2 5 ▁years ), ▁ruby ▁( 4 0 ▁years ), ▁golden ▁( 5 0 ▁years ), ▁diam ond ▁( 6 0 ▁years ), ▁and ▁plat in um ▁( 7 0 ▁years ). ▁ ▁Wed ding ▁anni vers aries ▁extend ▁the ▁j ub ile e ▁hierarchy ▁with ▁various ▁sequences ▁of ▁subst ances ▁filling ▁in ▁many ▁of ▁the