Please only include a reference -- such as
acc_ref=NHK -- if you have actually looked up the term in that reference. You'd previously created the Japanese 結婚指輪 entry and specified a pitch accent pattern of 0 (no downstep), sourcing this to the NHK reference. I have the NHK アクセント辞典 v1.02, and there is no entry for 結婚指輪. In addition, Daijirin lists pitch accent 5 (downstep after the fifth mora), not 0, as shown here on Weblio.