What Is the Difference Between Topaz and Citrine? A Complete Gemstone Guide
Topaz and citrine are two gemstones that often cause confusion due to their similar warm hues. However, they are distinct in several aspects, including their chemical composition, physical properties, and value. Understanding these differences is essential for jewellery enthusiasts and collectors alike.
In short: Topaz (Mohs 8) and citrine (a yellow variety of quartz, Mohs 7) are both yellow-orange gems but differ in chemistry, hardness and price. Topaz is roughly 5-10x more expensive: a 1.00ct fine Imperial topaz costs £200-£800 versus £20-£80 for citrine. Citrine is November birthstone, topaz November alternative. Test by refractive index (topaz 1.62, citrine 1.54), or by hardness — topaz scratches citrine.
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Origins and History
Topaz is a silicate mineral composed of aluminium and fluorine. It forms in igneous rocks and is commonly found in countries like Brazil, Sri Lanka, and Russia. Historically, topaz has been associated with strength and intelligence, often linked to sun deities in various cultures.
Citrine, on the other hand, is a variety of quartz. Its name is derived from the Latin word 'citrina', meaning 'yellow'. Natural citrine is relatively rare; most citrine on the market is produced by heat-treating amethyst or smoky quartz. Brazil is the leading producer of citrine, particularly from the state of Rio Grande do Sul.
Chemical Composition and Physical Properties
Topaz has the chemical formula Al₂SiO₄(F,OH)₂ and crystallises in the orthorhombic system. It ranks 8 on the Mohs hardness scale, indicating good durability. However, topaz has perfect cleavage, meaning it can split or chip if struck with sufficient force.
Citrine is composed of silicon dioxide (SiO₂) and belongs to the trigonal crystal system. It has a hardness of 7 on the Mohs scale, making it slightly less durable than topaz but still suitable for everyday wear. Unlike topaz, citrine lacks cleavage, reducing the risk of chipping.
