Birthstone Guide by Month
Birthstones show up constantly around gift-giving occasions — birthdays, graduations, and increasingly, push presents and anniversary gifts tied to a child's birth month rather than the parents'. Despite how often the concept comes up, the actual list of stones, their history, and which ones hold up to daily wear versus which ones need careful handling isn't something most buyers know in any detail before they start shopping. This guide breaks down each month specifically, along with the practical differences that matter once a stone leaves the store and becomes something worn regularly.
Where Birthstones Actually Come From
The birthstone list most commonly used today traces back to a standardized version published by the National Association of Jewelers in the United States in 1912, though the practice of assigning gemstones to months goes back much further, with roots tied to the twelve stones described in the biblical Breastplate of Aaron and later linked to zodiac traditions. The modern list has been revised a handful of times since, most notably in 1952 and again in 2002 and 2016, when a few additional stones were added to give buyers more options at different price points.
Because of these revisions, some months now have more than one recognized birthstone. That's not an error or inconsistency between sources — it's a deliberate expansion that gives shoppers a range from more affordable options to rarer, pricier alternatives for the same month.
January: Garnet
Garnet is often assumed to only come in deep red, but the stone actually occurs in nearly every color except blue, including green, orange, purple, and even color-changing varieties. Deep red remains the most traditional and widely available form for jewelry. Garnet sits at a 6.5 to 7.5 on the Mohs hardness scale, making it reasonably durable for daily wear in rings, though not quite as tough as sapphire or diamond.
February: Amethyst
Amethyst's purple color comes from trace iron within quartz crystal structure, combined with natural irradiation. Historically associated with clarity of mind and sobriety by ancient Greeks, the stone remains one of the more affordable and widely available birthstones, which makes it a popular choice for both birthstone jewelry and everyday statement pieces regardless of birth month.
March: Aquamarine and Bloodstone
Aquamarine, a pale blue-green variety of beryl, is the more commonly seen of the two March stones today. Its color ranges from a barely-there pastel blue to a deeper teal, with more saturated stones commanding significantly higher prices. Bloodstone, the older traditional option, is a dark green jasper flecked with red iron oxide spots, historically linked to protection and courage, though it's seen far less frequently in modern jewelry compared to aquamarine.
April: Diamond
Diamond needs little introduction as the hardest naturally occurring material, rating a 10 on the Mohs scale, which makes it the most durable birthstone option for daily wear of any kind. Clarity, cut, color, and carat weight — the standard four Cs — determine value far more than birth month association does, and diamonds remain the most consistently high-demand birthstone across nearly every jewelry category, not just birthstone-specific pieces.
May: Emerald
Emerald, a green variety of beryl, is prized for its color but is notably more included and fracture-prone than most other gemstones used in fine jewelry, which is why treatments like oiling to fill surface fractures are standard practice across the industry rather than a red flag. Buyers should expect visible inclusions in most natural emeralds; a perfectly clean emerald at a low price is more likely to be a lab-grown or heavily treated stone than an exceptional natural find.
June: Pearl, Alexandrite, and Moonstone
June holds three recognized birthstones, more than any other month. Pearl, the traditional option, is organic rather than mineral, formed inside mollusks and requiring gentler care than most gemstones since it's softer and more sensitive to chemicals, perfume, and acidity. Alexandrite, the rarest of the three, is famous for shifting color between green in daylight and red under incandescent light, and genuine natural alexandrite commands prices that can exceed diamond by weight due to its scarcity. Moonstone, a feldspar mineral known for its glowing, shifting sheen called adularescence, offers a more affordable middle ground between the other two.
July: Ruby
Ruby is a red variety of corundum, the same mineral family as sapphire, rating a 9 on the Mohs scale, second only to diamond in hardness. Color is the primary value driver — a deep, slightly purplish red often called "pigeon blood" commands the highest prices, while lighter or more brownish reds are considerably more accessible. Most rubies on the market today undergo heat treatment to improve color and clarity, which is standard and widely accepted practice rather than a quality concern.
August: Peridot, Spinel, and Sardonyx
Peridot, an olive-green gem formed from volcanic activity, remains the most commonly used August birthstone today. Spinel, added more recently to the official list, was historically mistaken for ruby and sapphire due to similar coloring and has only recently gained recognition as a valuable gem in its own right rather than a substitute. Sardonyx, a banded reddish-brown and white stone, is the oldest traditional option for the month but is rarely used in modern fine jewelry compared to the other two.
September: Sapphire
Sapphire refers to any corundum gem that isn't red — while blue remains the most iconic and requested color, sapphire actually occurs naturally in nearly every color, including pink, yellow, and green. At a 9 on the Mohs scale, sapphire is exceptionally durable, making it one of the more practical birthstone choices for everyday rings, which partly explains its enduring popularity for engagement rings beyond just its birthstone status.
October: Opal and Tourmaline
Opal is known for its play-of-color, a shifting rainbow effect caused by the microscopic structure of silica spheres within the stone. It's notably softer and more fragile than most gemstones, rating only 5.5 to 6.5 on the Mohs scale, and contains water content that can cause cracking if exposed to extreme temperature changes or prolonged dryness. Tourmaline, the second October option, comes in an unusually wide range of colors, including bi-colored and tri-colored stones within a single crystal, and offers considerably more durability than opal for daily wear.
November: Topaz and Citrine
Topaz occurs naturally in a range of colors, though colorless topaz is often treated to produce the popular blue shades seen widely in jewelry today. Imperial topaz, a natural orange-pink variety, is rarer and more valuable than the treated blue versions. Citrine, a yellow-to-orange variety of quartz, offers a warm, affordable alternative and is sometimes confused with the more expensive imperial topaz due to overlapping color ranges.
December: Turquoise, Tanzanite, and Zircon
Turquoise, the most historically established of the three, is an opaque blue-green stone that's notably porous and sensitive to oils, chemicals, and sunlight exposure, requiring more careful handling than most gemstones on this list. Tanzanite, discovered relatively recently in 1967 and found in only one location on Earth near Mount Kilimanjaro, offers a striking blue-purple color and has become a popular, more affordable-than-sapphire alternative for that color range. Zircon, frequently confused with cubic zirconia despite being an entirely different natural mineral, offers strong brilliance and comes in a range of colors, with blue zircon being the most commonly requested for jewelry.
Buying Birthstone Jewelry: A Few Practical Notes
Durability varies significantly across this list, which matters more for rings and bracelets than for earrings or necklaces that see less daily impact. Diamond, sapphire, and ruby sit at the top of the durability range and suit daily-wear rings well. Softer stones like opal, pearl, and turquoise are better suited to occasional-wear pieces or settings that protect the stone from direct impact, such as bezel settings rather than exposed prong settings.
For months with multiple recognized birthstones, price range typically explains why more than one option exists. June's alexandrite versus pearl, or December's tanzanite versus turquoise, represent significantly different price points for buyers, giving more flexibility depending on budget rather than simply offering redundant choices.
Frequently Asked Questions
Do I have to use my exact birth month's stone, or can I choose another month's stone I simply prefer? There's no rule requiring exact matching. Many buyers choose a stone from a different month based on color preference, durability, or budget, and birthstone jewelry given as a gift often reflects the recipient's actual birth month regardless of the giver's preference.
Are lab-grown birthstones considered "real"? Chemically, yes — lab-grown gems share the same mineral composition as their natural counterparts, differing only in origin. They're typically priced significantly lower and offer a practical alternative for buyers prioritizing size or clarity over natural origin.
Which birthstones require the most careful maintenance? Opal, pearl, turquoise, and emerald require the most caution, generally needing removal before swimming, showering, or exposure to household chemicals, along with gentler cleaning methods than harder stones like diamond or sapphire.
Why do some months have more than one official birthstone? Most multi-stone months trace back to the 1912 list being expanded over subsequent revisions, adding options that were either more affordable, more readily available, or simply hadn't been widely recognized as gemstones at the time the original list was created. Modern additions like tanzanite and spinel reflect gems discovered or reclassified well after the original standardized list was published.
