Program aims to educate young consumers about mined stones’ positive qualities.
Revenue fell 5% year on year in three months that ended January 28.
Website now listing synthetic stones larger than 4 carats.
Inflation and a shift to spending on experiences and travel dented results for third fiscal quarter.
Signet Jewelers has signed a deal to acquire online retailer Blue Nile for $360 million in cash.
Company jumps to 66th place from 78 last year.