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TopazDecember Birthstone Meaning: Three Blue Stones for One Month
December birthstone meaning runs across three stones. Turquoise stands for protection and honest speech in older traditions, zircon for restful sleep, and tanzanite for insight. Turquoise is the oldest and the name most charts print first. Tanzanite came last, from a single Tanzanian hillside found in 1967.
- Safe travel
- Truthful speech
- Insight
What Is the December Birthstone Called?
December answers to three names, and that is where the confusion starts. American jewelers standardized the month list in 1912 with turquoise in December, alongside lapis lazuli, which has since dropped off the modern American chart. A 1952 revision added zircon. Tanzanite joined in 2002, ninety years after the original list. All of this describes calendar months, and zodiac signs run on their own date boundaries and their own stone traditions.
Blue topaz turns up constantly in December searches, and topaz belongs to November on the very same chart. The blue material on the market is almost always colorless topaz that has been irradiated and heated, a standard and permanent treatment. Shops stock it in December because it is cheap and the color suits the month, so treat that pairing as commercial.
What December’s Stones Are Said to Mean
The meanings below come from lapidary tradition and crystal healing practice, flagged as belief because that is what they are.
Turquoise
Protection on the road is turquoise's oldest job. Persian riders, Silk Road merchants and traders in the American Southwest all carried it as a guard against falls and misfortune, and the habit turns up in cultures with no contact between them. Crystal healing practice traditionally assigns turquoise to honest speech, and practitioners hand it to people walking into a difficult conversation.
Zircon
Sleep and honor are the qualities medieval European lapidaries assigned to zircon, which they knew as jacinth. It was traditionally believed to keep a traveler from harm and to drive off bad dreams. Modern crystal healing practice keeps the sleep association and adds prosperity.
Tanzanite
Tanzanite is too young for ancient folklore, which makes its symbolism unusually easy to trace. The gem reached the market in 1968, and crystal healing writers of the following decades assigned it to insight and calm expression on the strength of its violet-blue color. Practitioners traditionally connect it to the third eye and the throat.
December Stone Color and Mineralogy
Three stones, three completely different materials. The chemistry, hardness and localities below come from standard gem references, and the sources are listed at the end of the page.
Turquoise
Copper gives turquoise its blue. Iron substituting for aluminum in the same structure pushes the color toward green, so a greener stone usually carries more iron. Turquoise forms near the surface where phosphate-rich groundwater weathers copper-bearing rock, so it arrives in thin veins and nodules with host rock often still attached as the brown or black webbing called matrix. Most turquoise sold today is stabilized with resin, because untreated material is soft and porous enough to absorb whatever it touches.
| Mineral | Turquoise |
| Formula | CuAl₆(PO₄)₄(OH)₈·4H₂O |
| Hardness | Mohs 6 |
| Crystal System | Triclinic |
| Colors | Sky blue, Robin's egg blue, Green-blue, Blue with brown matrix |
| Sources | Iran, Arizona (USA), China, Egypt, Chile, Mexico |
Zircon
Zircon is zirconium silicate, and it holds the record for the oldest material found on Earth's surface: crystals from the Jack Hills of Western Australia have been dated to about 4.4 billion years. Cubic zirconia is a separate substance, grown in a laboratory from zirconium oxide to imitate diamond. The two names look alike and share nothing else. Most blue zircon in shops is heat-treated brown material from Cambodia.
| Mineral | Zircon |
| Formula | ZrSiO₄ |
| Hardness | Mohs 7.5 |
| Crystal System | Tetragonal |
| Colors | Blue, Colorless, Yellow, Orange, Red, Green, Brown |
| Sources | Cambodia, Sri Lanka, Myanmar, Australia, Tanzania |
Tanzanite
Tanzanite is a variety of the mineral zoisite, and commercial supply comes from a strip of the Merelani Hills in northern Tanzania only a few kilometers across. Almost every stone you see has been heated, which turns brownish rough permanently violet-blue. Perfect cleavage in one direction means a sharp knock can split it along a flat plane however well it was cut.
| Mineral | Zoisite |
| Formula | Ca₂Al₃(SiO₄)(Si₂O₇)O(OH) |
| Hardness | Mohs 6.5 |
| Crystal System | Orthorhombic |
| Colors | Violet-blue, Blue-violet, Purple |
| Sources | Tanzania (Merelani Hills), Kenya (minor zoisite occurrences), Pakistan (minor zoisite occurrences) |
December Birthdays and Their Two Zodiac Signs
December splits between Sagittarius and Capricorn. Sagittarius runs to December 21, and Capricorn opens on December 22 and carries on into January. Born on December 5, your month stone is turquoise and Sagittarius's modern zodiac stone is turquoise too, so both systems point the same way. Born on December 28, your month stones are still December's three, while Capricorn's modern zodiac stone is garnet, which belongs to January on the month chart. The two systems were built for different purposes.
How to Wear and Care for December’s Stones
Mohs numbers describe scratching and stop there. Each of December's three stones has a separate weak point that hardness alone will never predict.
- Porosity is the whole problem with turquoise. The stone drinks in oil, sunscreen and sweat, and absorbed liquid can turn a bright blue permanently green, so put it on last and take it off first.
- A dry cloth is the entire cleaning routine for turquoise. Water carries dissolved soap into the pores, and an ultrasonic cleaner drives it deeper.
- One flat direction inside a tanzanite will split under impact, which is what perfect cleavage means. Pendants and earrings are the safe settings, and a tanzanite ring wants a bezel.
- Chipping shows up on zircon's facet edges long before scratches do. Mohs 7.5 sounds robust, and the stone is still brittle, so store it apart from harder gems and expect wear where the edges meet.
- Sunlight is worth avoiding for all three. Turquoise fades and greens under it, and some heat-treated zircon drifts back toward its original color after long exposure.
December Birthstone Questions People Ask
What is the December birthstone called?
December carries three names on the modern American chart: turquoise, zircon and tanzanite. Turquoise is the oldest of the three and the one most jewelers print first. Retailers usually display only one. The month ends up looking like it has a single answer.
Is the December birthstone turquoise or topaz?
Turquoise. Topaz belongs to November on the same month chart. Blue topaz appears in December displays because its color suits the month and the material is cheap to produce, and that placement comes from retail practice with no birthstone list behind it.
December birthstone: tanzanite, zircon or turquoise?
All three are official, and they arrived at different times: turquoise in 1912, zircon in a 1952 revision, tanzanite in 2002. Pick by durability if the piece will be worn hard. Zircon is the hardest of the three at Mohs 7.5, and turquoise the softest at Mohs 6.
Is zircon the same as cubic zirconia?
No. Zircon is a natural mineral, zirconium silicate, and some zircon crystals are the oldest dated material on Earth. Cubic zirconia is grown in a laboratory from zirconium oxide to imitate diamond. The names look alike, and the two have different chemistry, different hardness and different origins.
What is the traditional December birthstone?
Turquoise. It carried the month on its own in most older American and European lists, with lapis lazuli beside it on the 1912 chart. Zodiac tradition takes a separate route: December's Sagittarius portion is usually linked to topaz, and its Capricorn portion to ruby.
What does the December birthstone mean spiritually?
Protection and honest speech are the qualities traditionally attached to turquoise, and crystal healing practice links it to the throat. Zircon carries older associations with restful sleep, and tanzanite with insight. All of this is belief inherited from lapidary writing and modern crystal practice, with no clinical support.
Three stones for one month is the record of a list that kept being revised. Turquoise offers five thousand years of history and needs the most care. Zircon offers hardness and a persistent name problem. Tanzanite offers one hillside and one color. The mineral facts here can be checked against the references below, and the meanings are inherited belief.
References
- Turquoise — Gemological Institute of America (GIA)
- Turquoise — International Gem Society
- Zircon — Gemological Institute of America (GIA)
- Zircon — International Gem Society
- Tanzanite — Gemological Institute of America (GIA)
- Tanzanite — International Gem Society
“The safest cleaning methods are also the easiest.”
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