December Birthstone: Turquoise Meaning, Color & History

Turquoise illustration

Zircon, one of December’s three birthstones, is a genuine, naturally occurring gem with its own sparkle and history, and it has nothing to do with cubic zirconia, the lab-made diamond stand-in it constantly gets mistaken for. That mix-up is worth clearing up before you shop, because December doesn’t hand you one blue stone, it hands you three: turquoise, tanzanite, and zircon, each with its own chemistry, durability, and care routine behind a loosely similar color.

December at a glance

• Birthstones: turquoise, tanzanite, and zircon
• Turquoise: blue-to-green material, 6–7 Mohs
• Tanzanite: blue to bluish purple; better protected in earrings or pendants
• Zircon: 6–7.5 Mohs, with blue, colorless, and warm colors available
• Shared care default: warm, soapy water; avoid ultrasonic and steam cleaning

Turquoise: handle its softness with respect

Turquoise is a hydrated copper-and-aluminum phosphate mineral, and that copper content is exactly what gives it its blue-to-green range. At 6 to 7 on the Mohs scale, it resists normal heat, light, and common chemicals reasonably well, but very high heat or a sudden temperature swing can crack it, it abrades easily against everyday dust and grit, and it’s vulnerable to hydrochloric and hydrofluoric acids specifically. The dark matrix, or host-rock pattern, sometimes visible across a cabochon is part of the stone’s character rather than a defect, though turquoise is also commonly treated with wax, paraffin, plastic, or dye to improve color or durability, and that stabilization should always be disclosed.

A smooth turquoise cabochon fares better in a protected ring or a pendant than in an exposed, rough-wear piece. Clean it gently with warm soapy water and a soft cloth or brush, dry it promptly, keep it away from household chemicals, and store it apart from harder stones that could scratch it.

Tanzanite: gorgeous, but pick its jewelry carefully

Tanzanite is a blue-to-violet variety of zoisite found commercially near Tanzania’s Mount Kilimanjaro, and nearly all of it is heated to bring out that familiar blue-to-violet color, a stable treatment under normal wear. Its moderate hardness and perfect cleavage make it a less forgiving ring stone than its beauty might suggest, which is why GIA points buyers toward earrings and pendants first; a protective mounting and a bit of extra care can still make a special-occasion ring work. Warm soapy water is the safest cleaning method, and ultrasonic or steam cleaners are never recommended. Its localized source near Kilimanjaro is a great conversation piece, not a guarantee that every stone shares the same rarity or price.

Zircon: the natural gem that isn’t cubic zirconia

Zircon occurs in a genuinely wide color range and is known for strong dispersion, the flashes of spectral fire that give a well-cut stone real sparkle. Blue zircon usually starts as brown material that’s heat treated to shift its color, and while that treatment is common and generally accepted, it’s worth knowing that some heat-treated stones can drift back toward light brown after prolonged bright light exposure. Zircon tends to abrade fairly easily, so it’s smart to remove it for gardening, sports, and dishes, and stick to a soft brush with mild soap in warm water rather than an ultrasonic or steam cleaner.

Budget and disclosure

Each December stone follows its own budget logic. Turquoise value tracks color, condition, treatment, and workmanship. Tanzanite and zircon price shifts with color, size, cut, clarity, and treatment. Whatever you’re considering, ask about treatments and confirm the material’s identity before comparing prices, since three stones this different shouldn’t be judged against a single “December price.”

Why December, and the calendar tradition

Turquoise, tanzanite, and zircon share December’s spot in the modern Western birthstone tradition, covering every date in the month rather than singling any one out, and they’re unrelated to Western zodiac associations. The birthstones hub covers the rest of the year, and the birthday calculator has more on your own date.

Choosing your December stone

For turquoise, look at the color, matrix pattern, and polish, and ask whether the stone has been stabilized, dyed, or reconstituted; a protective bezel makes the most sense for a ring, while a pendant or earrings sidestep the abrasion risk entirely. For tanzanite, favor earrings or a pendant for everyday wear and view the stone under a couple of different lighting conditions, since its blue and violet components can shift in emphasis; ask plainly whether it’s heated and whether it’s natural or laboratory-grown. For zircon, examine the cut and facet edges as closely as the color, since a well-cut stone makes the most of that signature sparkle, and lean toward protected designs if the wearer is hard on jewelry.

A useful conversation with any seller should identify the exact material, any enhancements, how protective the setting is, and a realistic care routine. That’s what turns December’s three-stone tradition into three genuine choices, rather than three versions of the same blue gem.