The reality star continued, “I went under there and it was saltwater so it kind of hurt to open my eyes, but I just opened my eyes and looked around and I saw something shining. Swam all the way down there—it was, like, 10 feet—picked it up, and it was the shining diamond! It was literally there in just two minutes.

Kylie had provided the private jet that carried the sisters to their recent tropical trip, which took place soon after Khloe turned 38 in late June. The brothers were also guests. Rob KardashianHis daughter, Dream KardashianKhloe, 5 and a Khloe daughter True Thompson, 4.

Check out photos taken on Khloe’s birthday vacation: