Citrine is one of two recognised birthstones for November, the other being topaz. A variety of macrocrystalline quartz coloured by trace ferric iron impurities, citrine ranges from pale lemon yellow through rich amber to deep orange-brown. Its designation as a November birthstone dates to 1912, when the American National Retail Jewellers Association formalised the modern birthstone list and added citrine as an accessible companion to the more costly topaz — both stones sharing the warm, autumnal colour palette long associated with the eleventh month.

Why Citrine and November

The pairing of warm yellow and orange gemstones with November has roots in earlier, less standardised birthstone traditions. When the 1912 list codified the practice for the American market, topaz held the primary position, but its relative scarcity and higher price made an alternative desirable. Citrine, which closely mimics the yellow and orange tones of precious topaz at a fraction of the cost, was the natural choice. Both the American Gem Trade Association (AGTA) and GIA recognise citrine alongside topaz as a November birthstone.

Gemmological Character

Citrine belongs to the trigonal crystal system and shares the fundamental composition of all quartz: silicon dioxide (SiO₂). Its refractive index of approximately 1.544–1.553 and hardness of 7 on the Mohs scale make it a practical choice for everyday jewellery. The yellow-to-orange colour arises from iron in the Fe³⁺ oxidation state within the crystal lattice. Natural citrine of fine colour is considerably rarer than the market might suggest; the majority of commercial citrine is produced by heat-treating amethyst or smoky quartz, a process that converts the violet or grey-brown colour to yellow or orange by altering the iron oxidation state. This treatment is stable, universally accepted in the trade, and does not require disclosure under standard industry practice, though reputable dealers will note it.

Natural vs. Heat-Treated Material

Distinguishing natural citrine from heated amethyst can be challenging even for experienced gemmologists. Natural citrine typically displays a pale to medium yellow with a slightly greenish cast, while heat-treated material tends toward deeper orange and reddish-orange tones. Inclusions and colour-zoning patterns may offer further clues, but no single test is definitive. The most commercially prominent "citrines" — including the deep orange-red stones marketed as Madeira citrine and the bright orange material sold as Rio Grande citrine — are almost invariably heat-treated amethyst from Brazilian deposits, particularly those in Rio Grande do Sul.

Care for November Birthstone Jewellery

Citrine is a durable stone well suited to rings, pendants, and bracelets. At Mohs 7, it resists everyday scratching adequately, though it should be stored away from harder stones such as sapphire, ruby, or diamond to avoid abrasion. Prolonged exposure to strong sunlight or heat can fade colour in some specimens, particularly those of heat-treated origin; storage away from direct light is advisable for fine pieces. Ultrasonic cleaners are generally safe for untreated and heat-treated citrine that is free of significant fractures, but warm soapy water and a soft brush remain the most reliably gentle cleaning method. Avoid steam cleaning and harsh chemical solvents.

In the Trade

Citrine is among the most commercially available of all coloured gemstones, produced in large quantities from Brazil, Bolivia, Spain, and parts of Africa. Its affordability relative to topaz means it dominates the November birthstone market at most retail price points. Fine natural citrine of deep, saturated colour commands a modest premium over heat-treated material, though prices remain accessible compared to most other coloured stones. The stone is frequently cut in large sizes — ovals, cushions, and emerald cuts — that showcase its warm transparency to full effect.

Further Reading

• GIA Citrine Description — gia.edu
• AGTA Citrine — agta.org