Spoiler Alert: Gifts from your kids

Last night, Christmas Eve, everyone opened one of gift, except for Chris, who is a purist. Eye roll.
I opened a gift from Liam, a necklace with a black stone. Jacob admired it and asked if it was from him. I said, no, Liam gave it to me!
Jacob said, "Will you wear my necklace with the emerald inside?"
I think you're giving away a present hint, I said.
Stroking my hair, Jacob whispered, like a hypnotist,
"You'll forget....."