Citrine 10x13-14x17mm Faceted Tumble Nugget - 15-16 Inch Hole Size_1.5mm At that time yellowish gems

At that time yellowish gems were called "topaz" in many parts of the world

Iron gives them blue

Australian Green Opal is a variety of Common Opal which is a mixture of Opal and nontronite

worshipped by the Incas

Silica-rich waters create hardened deposits that preserve coral skeletons

Citrine 10x13-14x17mm Faceted Tumble Nugget - 15-16 Inch Hole Size_1.5mm At that time yellowish gemsCitrine is a transparent Quartz, ranging in color from pale yellow to golden yellow, honey or brown, giving it a similar appearance to Topaz. It may also contain rainbow to colored or sparkling inclusions. The name comes from the French word for lemon, citron. It was a prized gem in Greece as far back as 300 BCE.