Birthstone Guide: Every Month's Stone, Its Meaning, and How to Wear It in Fine Jewellery
What Is a Birthstone and Where Did the Tradition Come From?
The tradition of wearing a stone associated with your birth month is ancient — it traces back to biblical accounts of the twelve stones in the breastplate of Aaron, later connected by scholars to the twelve months of the year and the twelve signs of the zodiac. The modern standardised list of birthstones was established in 1912 by the American National Retail Jewelers Association and has been refined several times since, most recently in 2002 when tanzanite was added to December.
Today, birthstones are used in fine jewellery in a variety of ways: as the centre stone in an engagement or dress ring, as accent stones alongside a diamond, or as a meaningful personalisation in a piece that would otherwise be a classic design. At Diamond Ateliers, we incorporate birthstones into bespoke designs regularly — from a sapphire halo echoing a partner's September birthday, to a pair of small emeralds flanking a diamond to mark a May anniversary.
Here is the complete guide to every birth month's stone: what it is, what it means, how to evaluate quality, and how to wear it in fine jewellery.
January — Garnet
The garnet is a richly coloured stone most commonly associated with deep red, though it actually occurs in nearly every colour of the spectrum — orange (spessartite), green (tsavorite and demantoid), and even colourless. The deep red variety, pyrope garnet, is what most people picture when they hear the name.
Garnet scores a 6.5–7.5 on the Mohs hardness scale — hard enough for jewellery but softer than the sapphire or ruby family. For a ring worn daily, choose a protected setting such as a bezel or a low-profile prong configuration that keeps the stone from catching on surfaces. For earrings and pendants, durability is less of a concern.
The symbolic meaning of garnet centres on love, loyalty, and protection during travel. It is also associated with light and energy. In fine jewellery, a deep red garnet set in yellow gold creates one of the most classically beautiful combinations in coloured stone work.
February — Amethyst
Amethyst is a purple variety of quartz, ranging from pale lilac to a deep, saturated violet. The finest amethysts have a rich, even purple colour with no visible zoning (patches of uneven colour distribution). The best sources today are Brazil, Zambia, and Uruguay — Zambian amethysts tend to be the deepest and most saturated.
At 7 on the Mohs scale, amethyst is moderately durable. It can fade with prolonged exposure to strong direct sunlight — a consideration for rings worn outdoors in Singapore's climate. A bezel or channel setting protects the stone well.
Amethyst was historically one of the most valued gemstones — considered as precious as ruby and sapphire — until large deposits were found in Brazil in the nineteenth century. Its historical associations include wisdom, clarity of mind, and royal authority. Today it is one of the most accessible coloured stones for fine jewellery, offering beautiful colour at a modest price point relative to its appearance.
March — Aquamarine
Aquamarine is a member of the beryl family — the same mineral family as emerald — and takes its name from the Latin for seawater. Its characteristic colour ranges from pale, icy blue to a richer blue-green, with the most prized stones showing a medium, even blue without visible green undertones.
Aquamarine scores 7.5–8 on the Mohs scale, making it a practical choice for everyday jewellery. It is also typically very clean (high clarity) by nature, which means even large stones are usually eye-clean — a significant advantage over emeralds, which are routinely included.
The stone is associated with the sea, with clarity of thought, and with calm. In fine jewellery, aquamarine is stunning in large, simply-set designs — an emerald-cut or oval aquamarine in a simple platinum solitaire setting shows the stone's colour and clarity to maximum effect. It also pairs beautifully with diamonds in a halo design, where the white brilliance of the diamonds amplifies the stone's cool blue.
April — Diamond
April birthdays have the simplest choice: the diamond. The hardest natural material on earth (10 on the Mohs scale), the most optically brilliant gemstone, and the stone most synonymous with love and commitment. A diamond needs no introduction here, but a few notes for April-birthday clients considering a diamond piece beyond an engagement ring:
A birthstone ring does not have to be an engagement ring. A simple diamond solitaire or a pavé diamond ring worn on the right hand is a classic birthday or milestone gift for April-born clients. Yellow diamonds, pink diamonds, and salt-and-pepper diamonds are also all available as birthstones with a more distinctive character than a colourless white diamond, worth considering for something more personal.
We design and source diamonds in all cuts, colours, and carat weights at Diamond Ateliers. A bespoke diamond ring designed around the wearer's taste is one of the most meaningful April birthday gifts possible.
May — Emerald
The emerald is one of the four classic precious gemstones, alongside ruby, sapphire, and diamond. Its characteristic green colour — which ranges from a light, slightly yellowish green to a deep, saturated green — comes from trace amounts of chromium and vanadium in the beryl crystal structure. The most valued emeralds have a rich, vivid green with an inner glow that the trade calls jardin (garden), referring to the characteristic internal inclusions that are accepted — even expected — in fine emeralds.
At 7.5–8 on the Mohs scale, emerald is hard, but it is almost always heavily included, which makes it more brittle and vulnerable to fracture than its hardness would suggest. Emeralds are routinely treated with oils or resins to fill surface-reaching fractures — this is a standard trade practice that should be disclosed by any reputable seller.
For a fine emerald in a ring worn daily, a protective setting is important. A bezel is ideal; a four-prong setting works well if the prongs are substantial enough. Avoid cleaning emeralds in an ultrasonic cleaner, as the vibrations can dislodge the filling treatment.
In the language of gemstones, emerald represents rebirth, fertility, and love. It is also the traditional stone for 20th and 35th wedding anniversaries. In fine jewellery, a Colombian or Zambian emerald set in yellow gold is one of the most striking combinations in coloured stone work.
June — Pearl, Alexandrite, or Moonstone
June is unusual in having three officially recognised birthstones, reflecting historical variation in different countries' traditions.
Pearl is the traditional June stone — the only gemstone produced by a living creature. Natural pearls are rare and extremely valuable; the vast majority of pearls sold today are cultured, grown with human assistance in pearl farms. South Sea pearls (golden or white) and Tahitian pearls (dark, with overtones of green, purple, and blue) are the finest cultured varieties. Pearls measure only 2.5–4.5 on the Mohs scale and require careful handling — they are sensitive to chemicals, cosmetics, and even perspiration.
Alexandrite is one of the rarest and most remarkable gemstones: a variety of chrysoberyl that appears green in daylight and red or purplish-red under incandescent light. Fine alexandrite with a strong colour change is extraordinarily rare and expensive; most commercially available stones have a modest colour shift. Lab-created alexandrite shows the colour change beautifully and is an accessible alternative.
Moonstone displays a distinctive floating light effect called adularescence — a blue or white glow that moves across the surface of the stone as it is turned in the light. It is evocative and atmospheric in fine jewellery, and increasingly popular in bespoke designs. Moonstone measures 6–6.5 on the Mohs scale and requires a protected setting for daily wear.
July — Ruby
The ruby is corundum — the same mineral family as sapphire — coloured red by traces of chromium. At 9 on the Mohs scale, it is one of the hardest gemstones and exceptionally durable for daily wear. A fine ruby combines this durability with a colour that has been associated with power, passion, and protection for millennia.
Quality in rubies is primarily assessed by colour. The most valued rubies have a vivid, medium-dark red with a slightly bluish tone — sometimes described as "pigeon blood" red — and come primarily from Myanmar (Burma). Thai, African (Mozambique, Madagascar), and Sri Lankan rubies are also available at various quality levels and price points.
Like emeralds, fine rubies are almost always included, and heat treatment to improve colour and clarity is standard in the trade. An untreated fine ruby commands a significant premium. Always ask about treatment disclosure when buying.
A ruby set in a diamond halo in 18k yellow or white gold is one of the most timelessly beautiful fine jewellery combinations — the red of the stone against white diamonds is a classic for very good reason.
August — Peridot, Spinel, or Sardonyx
Peridot is the primary August birthstone, with a distinctive yellow-green colour that is unlike any other gemstone. It is one of the few gemstones that occurs in only one colour — always some shade of green, ranging from yellowish-green to olive. The finest peridot has a rich, vivid lime green with minimal yellow or brown. At 6.5–7 on the Mohs scale, it benefits from a protected setting for daily wear. Peridot represents clarity, protection from nightmares, and positive energy.
Spinel was added as an official August birthstone in 2016. For centuries, fine red spinels were mistaken for rubies — the "Black Prince's Ruby" in the British Imperial Crown is actually a red spinel. Today, spinel is celebrated in its own right, available in red, pink, orange, blue, violet, and a near-colourless grey. It scores 8 on the Mohs scale, making it one of the most durable coloured gemstones. Red and hot-pink spinels in particular offer the vivid saturation of ruby at a significantly lower price point.
September — Sapphire
Sapphire is corundum in any colour except red (which is ruby). The most famous variety is blue sapphire, whose colour ranges from a pale cornflower blue to a rich, velvety royal blue. The finest blue sapphires traditionally come from Kashmir (now exceptionally rare), Myanmar, and Sri Lanka. Madagascar and Montana also produce beautiful stones.
At 9 on the Mohs scale, sapphire is the hardest coloured gemstone available for everyday jewellery (after diamond). This makes it an outstanding choice for engagement rings — perhaps most famously demonstrated by Princess Diana's (now Kate Middleton's) oval sapphire engagement ring, which has inspired countless similar designs.
Beyond blue, sapphires occur in every colour of the spectrum: pink, yellow, orange, green, and padparadscha (a rare orange-pink variety from Sri Lanka that commands a premium). Coloured sapphires offer extraordinary variety for bespoke jewellery and are among the most versatile stones we work with at Diamond Ateliers.
Heat treatment to improve colour and clarity is standard in the trade for most sapphires. Kashmir sapphires are almost always unheated, which is part of their extraordinary premium. For buyers considering sapphire for an engagement ring, we always discuss treatment disclosure and sourcing in detail.
October — Opal or Tourmaline
Opal is one of the most visually extraordinary gemstones — its characteristic play of colour, caused by the diffraction of light through microscopic silica spheres, produces flashes of spectral colour across the surface of the stone. No two opals are alike. Black opals (dark body colour with vivid colour play) from Lightning Ridge, Australia, are the most prized; white opals are more common and more affordable.
Opal measures only 5.5‒6.5 on the Mohs scale and contains significant water — up to 20% by weight — which means it can crack if allowed to dry out too quickly or exposed to extreme temperature changes. For this reason, opal is better suited to protected settings and pieces worn occasionally rather than an everyday ring. A pendant, earring, or right-hand dress ring in opal is typically more practical than an opal engagement ring.
Tourmaline is the alternative October stone, offered in an extraordinary range of colours — pink, red (rubellite), green, blue (indicolite), watermelon (pink core with green outer), and many others. At 7–7.5 on the Mohs scale, tourmaline is more practical for daily wear than opal and offers beautiful, vivid colour at accessible prices.
November — Topaz or Citrine
Topaz exists in many colours, but the November birthstone is specifically imperial topaz — a rich, warm orange with pink or red overtones. Imperial topaz is relatively rare and more valuable than the blue topaz commonly seen in jewellery stores (which is typically colourless topaz treated with irradiation to achieve its blue colour). At 8 on the Mohs scale, topaz is durable enough for fine jewellery, though it has perfect cleavage (internal planes along which it can split cleanly), which means hard knocks should be avoided.
Citrine is a yellow-to-orange variety of quartz, often confused with imperial topaz by appearance. It is more affordable and widely available than topaz. The finest citrine has a warm, saturated orange-yellow with no brown overtones. At 7 on the Mohs scale, it is suitable for most jewellery applications with appropriate care.
Both stones are associated with warmth, energy, and positive intention. In fine jewellery, warm orange and yellow stones look exceptional in yellow gold settings, which amplify rather than contrast the stone's colour.
December — Tanzanite, Turquoise, or Blue Zircon
Tanzanite is one of the most remarkable additions to the modern birthstone list. Discovered only in 1967 near Mount Kilimanjaro in Tanzania, it is found in a single location on earth and is considered by some geologists to be a thousand times rarer than diamond. Its colour — a deep, velvety blue-violet — shifts depending on the angle of viewing, appearing more blue in some lights and more violet in others. The finest tanzanite rivals fine sapphire in depth and saturation of colour.
At 6.5 on the Mohs scale, tanzanite is softer than sapphire and requires a protective setting for daily wear. A bezel or three-quarter bezel is ideal for a tanzanite engagement or dress ring. Tanzanite is always heat-treated — this is universal, fully accepted, and does not affect value. The treatment converts brownish raw crystals into the vivid blue-violet for which the stone is prized.
Turquoise is one of the oldest gemstones used in jewellery — ancient Egyptians, Persians, and Native Americans all valued it deeply. Its opaque, sky-blue to blue-green colour is immediately recognisable. Turquoise is porous and sensitive to oils, cosmetics, and sunlight, which limits its suitability for everyday fine jewellery wear. It is best appreciated in occasional pieces rather than daily wear rings.
Blue zircon (not to be confused with cubic zirconia, which is an entirely different material) is a natural gemstone with extraordinary brilliance — its dispersion (fire) rivals diamond. Fine blue zircon has a vivid teal-to-medium blue colour with strong sparkle. At 6–7.5 on the Mohs scale, it requires care in daily wear.
Incorporating Birthstones into Bespoke Jewellery
The most personal use of a birthstone is not a standard high-street piece but a bespoke design built around the stone's specific character, colour, and the wearer's taste. At Diamond Ateliers, we design around birthstones regularly — incorporating a partner's stone into an engagement ring as a meaningful hidden detail, using a child's birthstone in an anniversary band, or building an entirely coloured-stone solitaire for a client who wants something distinctive.
Every coloured stone project at our studio starts with sourcing: we look for a stone with the right colour saturation, clarity, and proportions before any design work begins, because the design should serve the stone, not the other way around. If you have a specific month, colour, or gemstone in mind, we would love to show you what is possible.
Explore Birthstone Jewellery at Diamond Ateliers
Whether you are designing an engagement ring that incorporates a meaningful gemstone, looking for a personal anniversary gift, or simply want to explore what your birth month's stone looks like in fine jewellery, we are happy to help.
Visit our showroom at 176 Orchard Rd, #03-05 The Centrepoint, Singapore 238843 to see coloured stones in person and discuss bespoke designs.