2027 Forecast

September 23 – October 22 · Air

Libra birthstones

Libra carries Opal and Peridot in the zodiac tradition.

US births under Libra
8.52% rank 5 of 12 signs
Born in October
72.5% of Libra births
Fine for a daily ring
0 of 2 neither stone

US SSA births 2000–2014 (FiveThirtyEight); our gemstone reference.

More on Libra: the Libra sign, Libra horoscope today and Libra compatibility.

The signs either side: Virgo birthstones and Scorpio birthstones.

Libra Birthstone: Opal and Peridot and What They Mean

Opal

Composition Hydrated silica (SiO₂·nH₂O) — 3 to 21 percent water by weight
Hardness · System 5.5–6.5 · Amorphous

The play of color comes from stacked silica spheres diffracting light — the same physics as a butterfly wing, not pigment.

Traditionally linked to imagination, emotional range and creative flow.

Peridot

Composition Magnesium iron silicate ((Mg,Fe)₂SiO₄) — gem-quality olivine
Hardness · System 6.5–7 · Orthorhombic

Peridot arrives on Earth in meteorites — pallasite meteorites carry gem-quality crystals formed beyond this planet.

Traditionally linked to lightness, release of resentment and fresh perspective.

The reasoning

Why Libra gets Opal and Peridot

Libra is ruled by Venus and is the sign of balance, beauty and partnership. Opal, the October stone, carries every color at once in a single flash, which suits a sign that weighs all sides before it decides; Romans prized it as a token of hope and love. Peridot, Libra's second stone, is tied to letting go of resentment, a useful gift for a sign that keeps the peace by swallowing its grievances. Between them they describe Libra at its best: open to everything, and light enough not to carry grudges.

Other stones often given to Libra

Tourmaline Lapis Lazuli Rose Quartz

Two systems, one birth date

Libra spans 2 calendar months, so you have more than one birthstone

Zodiac stones Opal, Peridot
Months it covers September and October
Stones of those months Sapphire, Opal, Tourmaline
In both systems Opal

September 23 – October 22 — so the sign opens in one month and closes in another. Why the two lists never line up → · The monthly chart →

Most Libra birthdays fall in October, so a jeweler working from the monthly chart will usually hand this sign Opal, the October stone: only 8 of its days are in September. September punches above its weight in births, though, with 27.5% of the sign’s US births in 2000–2014 from 26.7% of its days.

In the monthly chart, Opal is October’s modern birthstone; Peridot is August’s modern birthstone. Only one of those months falls inside Libra.

September Sapphire October Opal, Tourmaline

The stones themselves

Stone Mohs Crystal system Main sources
Opal 5.5–6.5 Amorphous Australia, Ethiopia, Mexico
Peridot 6.5–7 Orthorhombic Pakistan, Myanmar, USA (Arizona)

Opal (5.5–6.5) can be worn often with care around heat and dry air, which make it craze; Peridot (6.5–7) likewise needs care around acid and sudden changes of temperature. What the scale means →

Libra birthstones on the Mohs hardness scale
Libra birthstones on the Mohs hardness scaleMohs scale with the Libra zodiac stones (Opal 5.5–6.5, Peridot 6.5–7) filled and the stones of its calendar months outlined.Opal: Mohs 5.5–6.5Opal 5.5–6.5Peridot: Mohs 6.5–7Peridot 6.5–7Sapphire: Mohs 9Sapphire 9Tourmaline: Mohs 7–7.5Tourmaline 7–7.5Garnet: Mohs 6.5–7.5Amethyst: Mohs 7Citrine: Mohs 7Rose Quartz: Mohs 7Clear Quartz: Mohs 7Smoky Quartz: Mohs 7Aquamarine: Mohs 7.5–8Emerald: Mohs 7.5–8Bloodstone: Mohs 6.5–7Peridot: Mohs 6.5–7Sardonyx: Mohs 6.5–7Zircon: Mohs 6–7.5Carnelian: Mohs 6.5–7Onyx: Mohs 6.5–7Agate: Mohs 6.5–7Tiger's Eye: Mohs 6.5–7Aventurine: Mohs 6.5–7Diamond: Mohs 10Pearl: Mohs 2.5–4.5Alexandrite: Mohs 8.5Moonstone: Mohs 6–6.5Labradorite: Mohs 6–6.5Pyrite: Mohs 6–6.5Ruby: Mohs 9Sapphire: Mohs 9Spinel: Mohs 8Topaz: Mohs 8Opal: Mohs 5.5–6.5Rhodonite: Mohs 5.5–6.5Tourmaline: Mohs 7–7.5Turquoise: Mohs 5–6Lapis Lazuli: Mohs 5–6Hematite: Mohs 5–6Tanzanite: Mohs 6–7Jade: Mohs 6–7Obsidian: Mohs 5–5.5Malachite: Mohs 3.5–4Amber: Mohs 2–2.5Selenite: Mohs 2Fluorite: Mohs 4Sodalite: Mohs 5.5–6Kyanite: Mohs 4.5–7Lepidolite: Mohs 2.5–31Talc2Gypsum3Calcite4Fluorite5Apatite6Orthoclase7Quartz8Topaz9Corundum10Diamondfingernail 2.5window glass 5.5household dust (quartz) 7Source: Mohs scale minerals · ranges from our 43-stone referenceastrohot.com
Libra birthstones on the Mohs hardness scaleMohs scale with the Libra zodiac stones (Opal 5.5–6.5, Peridot 6.5–7) filled and the stones of its calendar months outlined.Opal: Mohs 5.5–6.5Opal 5.5–6.5Peridot: Mohs 6.5–7Peridot 6.5–7Sapphire: Mohs 9Sapphire 9Tourmaline: Mohs 7–7.5Tourmaline 7–7.51Talc2Gypsum3Calcite4Fluorite5Apatite6Orthoclase7Quartz8Topaz9Corundum10Diamondfingernail 2.5glass 5.5dust 7Source: Mohs scale minerals · ranges from our 43-stone referenceastrohot.com

Libra’s zodiac stones: Opal 5.5–6.5, Peridot 6.5–7. The September and October month stones it also covers: Sapphire 9, Tourmaline 7–7.5. Sapphire and Tourmaline stay at 7 or harder across their whole range, so dust cannot scratch them.

Cite this page

AstroHot. “Libra Birthstone: Opal and Peridot and What They Mean.” Accessed October 28, 2026. https://astrohot.com/birthstones/by-zodiac/libra/

For Wikipedia {{cite web |title=Libra Birthstone: Opal and Peridot and What They Mean |url=https://astrohot.com/birthstones/by-zodiac/libra/ |website=AstroHot |access-date=2026-10-28}}