Yeah, it's a collaboration with a jewelry maker, THE KISS. Here's the previous one:

Kaworu is modeling half of a couple's necklace set. The two pendants have the inscription "Good things come when we play together", and one has a purple stone to represent Shinji (Unit-01), while the other has a blue stone to represent Kaworu (Mark.06... yeah, that's outdated for Q, but it was the coloring system they used for the 2.0 collaborations, so I guess they kept that for the sake of consistency). The two pendants form a heart when joined together:
There are also couple's rings. The two rings have the inscription "I realize now that I was born to meet you", and again one has a purple stone to represent Shinji and one has a blue stone to represent Kaworu. Like the pendants, they form a heart when joined together:
Shinji is modeling the newest necklace, which has two crosses to show the bond between two people. One version has a purple stone to represent Shinji and a red stone to represent the world of Q, while the other one has a blue stone for Kaworu and a red stone for the world of Q:
Sorry for the lengthy explanation... when it comes to either books or jewelry, I could go on for hours.
