Topaz coming from a new find in Colombia - 100% natural. 

Alluvial shapes of topaz are formed by the action of water, and they are typically rounded and smooth. These shapes are ideal for cutting into gems because they have few inclusions and are free of fractures. When cut properly, topaz can exhibit a high level of brilliance and fire

Please note that it's likely some of the yellow/golden/tan color is coming from iron staining that is present on the surface. Mostly likely will end up faceting clear

102.870 grams / 514.35 carats / 50 x 37 x 26 mm / clean