Medium chain is 2.3 mm. 3. I think 4mm is small and going up is larger. Then, divide your answer by 24, since 24K is pure gold, and multiply that answer by your chain's karat to find the price by the gram. As the size of the jump ring gets bigger (diameter increases), the thickness of the wire should increase for it to hold more weight. But there should be some room allowed for minor variance,perhaps within a gram or two, as it is nearly impossible to maintain the same exact gram weight on all chains consistently, which is another reason why understanding the gram weight in gold jewelryis important. I have learned so much. Next, determine the karat of the item, which is usually 14K, 18K, or 24K. Gauge is a measurement of the thickness of something, be it beads, wire, thread, or needles. As a small thank you, wed like to offer you a $30 gift card (valid at GoNift.com). Why do guys wear gold chains? See answer (1) Copy. Its currently my only work around. 1.2" x 0.7". A Connected Anchor. Check a store's reviews to make sure they are credible before purchasing. Find out how to price gold chains from any jewelry retailer and to get the absolute best value possible. These cookies will be stored in your browser only with your consent. Piercing Gauge Sizes - Gauge to mm chart - Blue Banana What does this tell you? Thanks to all authors for creating a page that has been read 220,398 times. Here's an overview: Gauge refers to the thickness of metal or wire. 00 gauge = 3/8-inch or 9.3 millimeters.