I thought you viewed moissanite as costume jewelry :)
I agree they will benefit from engagements as they always likely do. I suspect peak time is right now as the average engagement is something like 13 months which totally fits. People likely get engaged on Valentine’s Day and have a spring wedding 13 or 14 months later.
I wonder if there was actually a dearth of new engagements last year with covid. If so then there may be some catch up effect. I just don’t know.