Citrine is not precious gemstone. Ruby, Sapphire and Emerald are precious gemstones, here are details about all three precious stones - navneetgems.com/Big-3-Ruby-Emerald-Sapphire
Adding more, not only stones from precious gems category are expensive but also other gems like Alexandrite, Tanzanite, Tourmaline are high in prices.
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Citrine is a very affordable semi-precious gemstone, and all its color ranges are not expensive. However, it is often confused with a topaz, which is very similar in color and body. Topaz is the more valuable gemstone so you must double check when purchasing a citrine.