I have no idea, but that is going to be one interesting fruit... My wild guess is some Japanese plum is going to pollinate it ...maybe? take pictures of the fruit when they ripen...:)

Here are the posisble pollinators for Bella Gold peacotums, inluding sweet treat pluerry, according to Tom Spellman from DWN:

"Any Pluot or Japanese type plum that blooms at the same time. Both are easily pollinated by many varieties like Flavor King, F. Queen, Emerald Drop, Beauty Plum, Hollywood, Wickson. Bella Gold can also cross with Apricot Gold Kist and Aprium cot-n-candy. For best results pollinators should be planted within 20'"

Second year for me. No blossoms.