Ever heard about KDM & Non KDM jewellery? So what does KDM jewellery mean? Before talking about KDM, we will tell you about jewellery making in short. The basic process in jewellery crafting is soldering a myriad of intricate gold parts. Without soldering, there is hardly any jewel that can be done. Needless to say this solder should have a melting temperature lower than that of gold, so just the solder melts and joins gold pieces without affecting the gold parts. Earlier this solder was a combination of Gold & Copper. Though there was no particular ratio for this solder, generally it was about 60% gold + 40% copper. Since this alloy was very strong and also easy to make, it was widely used in jewellery making for a long time. But the downside to this solder is that, the purity of the solder is only 60%. So when this jewel is melted, the quality will be less than 22 carat. This is the reason your old jewels may carry an seal of 22/20 (20 carat represents the melting purity).
