From the International Natural Gold market, the universal terms is that the larger the mesh number, the smaller the nugget. Size from 50-80 mesh is called gold dust. 2-30 mesh is called nuggets.Natural gold nuggets never have a fixed karat value. Alaskan gold nuggets are all individually different from 17-22k, mostly 20-22k. Natural gold never comes with 24k. 24k Pure gold is Man-Made. With such a large inventory of gold, we are unable to test each item's karat value, we cannot guarantee the karat value of our item listing. All my gold is 100% real natural gold. Instructions to using the "Gold Test Acid with Testing Stone Kit" to check gold purity on YouTube: Youtube. The item "15 Gram Alaska Natural Gold Nuggets (#GTC15g) Hand-Picked Quality" is in sale since Monday, March 27, 2017. This item is in the category "Coins & Paper Money\Bullion\Gold\Nuggets". The seller is "gemsale" and is located in USA. This item can be shipped worldwide.