Imperial Topaz Crystal Specimens “E Quality” 25ct Bags This is an extra quality stone, the clarity on each stone is very high shining beautifully under light. There are approximately 3 to 9 pieces per bag while some may exhibit natural termination on the stone. Topaz rates an 8 on the hardness scale. It is a hard brilliant stone with a fine color range. In fact, the color of topaz is more important than the size in determining its value. This Brazilian imperial topaz can often have a bright yellow to deep golden brown hue. The term “imperial topaz” refers to reddish-orange color the deep golden yellow. In the past, all yellow gems were topaz, and that all topaz was yellow.