A$AP Rocky sent Rihanna an incredibly personal bracelet, and the jewelry designer who made it has shared the unique significance of each of its charms—one of which might even hint to the baby’s due date.

The singer, 34, has been photographed wearing the expensive necklace often over the past few weeks. Her longtime boyfriend, 33-year-old A$AP, gave her the expensive piece of jewelry back in February.

The Umbrella singer first declared in January that she and the rapper were having their first child together. She hasn’t yet given a due date for the infant, but last month she told Elle Magazine that she was in her third trimester.

And now that it’s been revealed that her boyfriend carefully chose a May birthstone locket to include in the assortment of charms, his thoughtful present has provided a significant hint as to Rihanna’s due date.