I'm not very familiar with zircons, but the person who sold me this one said that it is difficult to find this cambodian blue saturated color...is that true?
Yes and no - lol. Saturated blue zircons are out there, but you have to weed though a lot of pale ones to find a good one (which yours looks to be). I think your problem is going to be more of getting another one that exact size and color, as blue zircons are heated so they come in a wide range of shades and saturations of blue. It may be easier to contact a precision cutter and see if they have a set of stones that they have (or can) cut from the same rough so you will be sure to get the same size and color. Then you can use your stone for a matching pendant. Small (earring size) blue zircons shouldn't be budget busters and I'd definitely suggest precision cut stones for earrings because you want lots of sparkle (assuming they aren't going to be big stones).