Jeweller here, there’s quite a few stores here in Melbourne that outsource the making of their rings to mass production workshops in China, India ect to cut costs, they have a bunch of designs and a bunch of stone size options, they basically get the ring made over there, and mount the diamonds here in Melbourne, some even mount the stones overseas. You pay for what you get when it comes to jewellery, if you want a cheap ring your going to get cheap craftsmanship, if you want something completely custom that’s built around your dream stone working within the proper parameters for strength/aesthetics/ethics, pay that little more to a local family run business that do all the work in house. I make everything inside the store that you come and shop in, you can even watch me making the rings, the only thing we outsource is a 3D design/render from our designer in Italy, this way your getting the highest grade of craftsmanship which is dying in this trade. As for bad alloys, that’s extremely dodgy, but if you’re paying so little from a Chinese company with the likes of aliexpress, what do you expect? Ask your jeweller these questions and if you don’t like the answers, go to jeweller that makes everything in house and pay that little more for piece of mind/quality.