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Zircon · ZrSiO₄ · 7.5

Zircon

Zircon is a natural gem, not cubic zirconia. It is zirconium silicate, with more fire than almost any natural gem except diamond and demantoid, and it is the oldest mineral on earth: grains from Australia are about 4.4 billion years old. Most blue zircon is natural brown zircon heated in Cambodia. On Amazon, nearly everything called "zircon" in jewellery is actually cubic zirconia, so real zircon is easy to miss.

From the ground to your hand

The same stone at four moments. Tap a photo of a listing to see it on Amazon.

  1. 01 In the ground (step 1 of 4)

    A cognac-coloured zircon crystal on its rock, Gilgit, Pakistan.

    A cognac-coloured zircon crystal on its rock, Gilgit, Pakistan.

    Real specimen. Photo: Robert M. Lavinsky, CC BY-SA 3.0.

  2. 02 Cut (step 2 of 4)

    Blue zircon surrounded by yellow diamonds in a Tiffany & Co. pendant necklace from the early 1900s, when Louis Comfort Tiffany ran its art jewellery department. Walters Art Museum, Baltimore.

    Blue zircon surrounded by yellow diamonds in a Tiffany & Co. pendant necklace from the early 1900s, when Louis Comfort Tiffany ran its art jewellery department. Walters Art Museum, Baltimore.

    Real specimen. Photo: Walters Art Museum, Public domain.

  3. 03 Rough to own (step 3 of 4)

    A natural zircon crystal from Tanzania.

    A natural zircon crystal from Tanzania.

    Amazon listing photo. See it on Amazon

  4. 04 Loose (step 4 of 4)

    A 5.21 ct Cambodian blue zircon, 12 x 9 mm, from PUHARGEMS.

    A 5.21 ct Cambodian blue zircon, 12 x 9 mm, from PUHARGEMS.

    Amazon listing photo. See it on Amazon

Mineral
Zircon (zirconium silicate)
Colours
Brown, yellow, red, green; blue by heating
Hardness
7.5
Grown in labs?
Not commercially. Cubic zirconia is a different, man-made material
Famous sources
Cambodia, Sri Lanka, Myanmar, Tanzania

Famous zircon in museums

What the finest natural stones look like: real pieces in public collections. The whole gem museum.

A Tiffany pendant with a blue zircon: A pendant necklace by Tiffany & Co. with a large blue zircon in the centre, surrounded by canary and coloured diamonds, demantoid garnets and amethysts, on platinum chains with coloured pearls.
A Tiffany pendant with a blue zirconA pendant necklace by Tiffany & Co. with a large blue zircon in the centre, surrounded by canary and coloured diamonds, demantoid garnets and amethysts, on platinum chains with coloured pearls.Walters Art Museum, BaltimoreIt was bought as a wedding present, at a time when Louis Comfort Tiffany was pushing the firm toward bold coloured stones.Photo: Walters Art Museum, Public domain.

Zircon vs cubic zirconia

Mined and lab-grown zircon are the same mineral; this is what differs
ZirconCubic zirconia (CZ)
What it isA natural mineral, zirconium silicateA man-made crystal, zirconium oxide, made since the 1970s
LooksStrong fire; facet edges look doubled through the stoneStrong fire; no doubling
AgeUp to 4.4 billion yearsMade last year
PriceTens to hundreds of dollars a carat for fine blueCents
On AmazonUsually says "natural" and names Cambodia or Sri LankaOften just called "zircon" in jewellery titles

Fine Cambodian blue zircon costs roughly $50 to $150 a carat. A "94 ct certified natural zircon" for $35 is not one. Read the title: real zircon listings say natural and name the origin.

Treatments. Almost all blue and colourless zircon is heated brown zircon. A few heated stones can fade back slightly over time in strong light. Some zircon contains traces of uranium and is very slightly radioactive, far below any level of concern in jewellery. All gem treatments explained.

Where natural zircon comes from

Pins mark mining districts, not exact mines. Drag to move, pinch or scroll to zoom, tap a pin to read about it. Map data © OpenStreetMap contributors.

List of every place on the map (4)
  • Zircon: Ratanakiri, Cambodia. The source of most blue zircon, made blue by heating brown crystals.
  • Zircon: Ratnapura and gem gravels, Sri Lanka. Zircon in many colours from the island’s gem gravels.
  • Zircon: Jack Hills, Western Australia, Australia. Tiny zircon grains here are about 4.4 billion years old, the oldest pieces of the earth ever found.
  • Zircon: Tunduru and Umba, Tanzania. Red, orange and yellow zircon from gem gravels.

How it is cut

Lab zircon is mostly machine-cut in calibrated sizes, which is why a cut lab stone costs little more than its rough. Fine mined stones are often native-cut to keep weight, then recut by precision cutters. See cuts from easiest to hardest and whether cutting your own is cheaper than buying cut.

What to buy

Checked in stock on October 10, 2026. Photos are the listings' own; prices are rounded.

Moissanite vs lab diamondReading a gem listing

The zircon shop: 10 more pieces we trust

Every piece names the real stone and comes from a seller with a record, checked in stock on October 11, 2026. Photos are the listings' own; prices are rounded.

Loose stones5.55 ctPUHARGEMS Cambodian blue zircon, cushion, 5.55 ctNatural zircon, heated to blue as almost all blue zircon is.about $630on Amazon →Loose stones2.93 ctPUHARGEMS Cambodian blue zircon, oval, 2.93 ctabout $320on Amazon →Loose stones2.81 ctNatural Cambodian neon blue zircon, oval, 2.81 ctabout $150on Amazon →Loose stones1.32 ctUnheated honey-brown zircon, cushion, 1.32 ctThe colour zircon comes out of the ground.about $72on Amazon →Loose stonesNatural white zircon, 1.25 mm, AfricaTiny natural white zircon: the old diamond substitute, a real gem in its own right.about $12on Amazon →WomenCambodian blue zircon and diamond ring, 14K white goldabout $1,030on Amazon →WomenCambodian blue zircon and diamond ring, 14K yellow goldabout $2,730on Amazon →WomenNatural blue zircon tennis bracelet, 6 x 4 mm ovals, sterling silverabout $210on Amazon →Women16 ctCambodian blue zircon bracelet, 16 ct, sterling silverabout $200on Amazon →WomenCambodian blue zircon cross pendant, sterling silverabout $75on Amazon →

Your kit for zircon

Five tools that let you check what you bought (a loupe, a UV torch, locking tweezers, a gem box and a pocket scale), plus a turntable that spins your stone under the light the way jewellers show one. The full collector's kit.

LookGemOro 10x triplet loupeunder $20LookDARKBEAM filtered 365 nm UV flashlightabout $10HandleHonoson locking tweezers, 3 packabout $10StoreTeensery gem display boxes with clear lids, 10 packabout $9ShowComXim motorized turntable, adjustable speed and directionabout $15MeasureGemOro Platinum XP500 pocket scale, 0.01 gabout $40

In short

Zircon grows over millions of years in the earth, or in hours to months in a lab. Both are real zircon; the mined stone is rare and priced for rarity, the lab stone is priced for the cost of growing it. Buy lab to wear and enjoy, check the listing names the mineral, and test it when it arrives.

See our first pick: PUHARGEMS Cambodian blue zircon, oval, 5.21 ct

Frequently Asked Questions

Is zircon the same as cubic zirconia?

No. Zircon is a natural gem, zirconium silicate. Cubic zirconia is a man-made crystal of zirconium oxide. On Amazon, most jewellery titled "zircon" is cubic zirconia.

Is blue zircon natural?

The zircon is natural; the blue almost always comes from heating brown zircon, mostly from Ratanakiri in Cambodia. This is standard and accepted.

Why is zircon the oldest mineral?

Zircon is so tough that grains survive for billions of years, and the uranium inside lets scientists date them. Grains from the Jack Hills in Australia are about 4.4 billion years old.

Is zircon a birthstone?

Yes, blue zircon is a December birthstone, alongside tanzanite and turquoise.

Photo credits

  • zircon-crystal-gilgit.webp: Robert M. Lavinsky, CC BY-SA 3.0, via Wikimedia Commons.
  • zircon-tiffany-necklace.webp: Walters Art Museum, Public domain, via Wikimedia Commons.
  • Product photos: Amazon listings, via the Amazon Product Advertising (Creators) API.

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