Avril's already posted selfies flaunting the chain and was spotted wearing it Thursday night in Los Angeles.
We're told the bling features 50 carats of white diamonds, black diamonds and pink sapphires. Diversity matters! 💎😂
As you can see, the chain features several pendants ... one with Avril's first name, two with the letter "A" imposed over a pink heart, and a pair of skulls and crossbones with pink ribbons.
We're told Tyga reached out to Eric three weeks ago, right before Paris Fashion Week, to make the piece.
The timing is worth noting ... because Tyga and Avril started hanging out a lot more when they were in Paris, kissing for the cameras and strolling through the streets hand in hand.
TMZ broke the story ... Tyga and Avril are still in the early stages of dating, and they're not putting any labels ... like girlfriend/boyfriend on anything, at least not yet.
It will be interesting to see if the expensive diamond gift changes that.