Birthstones by Month: Complete Guide to Gemstones, Lab-Grown Options & Certification (2026)
Choosing a birthstone shouldn't be confusing. Whether you're buying for yourself, a partner, or a loved one, birthstones combine personal meaning with real jewellery value — but knowing which stones are worth the investment, and which come with hidden pitfalls, makes all the difference. This guide walks you through everything: origins, pricing, lab-grown options, and how certification actually works.
What Are Birthstones and Where Do They Come From?
Birthstones are gemstones associated with each month of the year. They've been around far longer than most people realise — the concept traces back to the Biblical Breastplate of Aaron, a ceremonial garment described as set with 12 gemstones representing the 12 tribes of Israel. Over centuries, those stones became linked to zodiac signs, then eventually to calendar months.
The modern list we use today was standardised in 1912 by the American National Retail Jewelers Association — which means it's less than 120 years old. The list has been tweaked a few times since, mostly to add alternatives when certain stones became scarce or expensive. This is why some months have two or three options.
Birthstones are based on tradition and industry consensus, not scientific classification. There's no "wrong" choice — but understanding what you're buying helps you spend wisely.
Natural Birthstone Price Guide: Which Months Cost More?
Not all birthstones are equally valuable. The price difference between a 1ct ruby and a 1ct amethyst can be tenfold or more. Here's how they stack up by value tier:
Ruby (Jul)
Sapphire (Sep)
Emerald (May)
Tanzanite (Dec)
Tsavorite (premium alt)
Topaz (Nov)
Tourmaline (Oct)
Garnet (Jan)
Citrine (Nov)
Peridot (Aug)
Opal (Oct)
Turquoise (Dec)
Price is driven by rarity, durability (hardness on the Mohs scale), colour saturation, and treatment history. A ruby treated with heat filler is worth far less than an untreated one of the same size — which is why certification matters for the high-value tier.
All 12 Birthstones: Monthly Guide with Lab-Grown Options
Here's every month's birthstone, what makes it special, and whether a lab-grown version is available for those wanting a more accessible or ethical alternative.
Deep red is classic, but garnet spans orange, green (tsavorite), and even colour-change varieties. Natural stones are generally affordable — lab alternatives aren't widely produced commercially.
One of the most budget-friendly birthstones. Lab-grown versions exist, but since natural amethyst is already affordable, the cost advantage is minimal. Focus on depth of purple and clarity.
Prized for its clear, pale blue — the colour of shallow ocean water. Natural aquamarine is relatively clean to the eye. Heat treatment to reduce greenish tones is standard and accepted.
The most standardised birthstone category. Lab-grown diamonds are chemically, physically, and optically identical to mined diamonds — at a fraction of the cost. IGI certification covers colour, clarity, cut, and carat identically to natural stones. Learn more about lab-grown diamonds →
Emeralds almost always have internal inclusions — called "jardin" (French for garden) — this is normal and expected. Most natural emeralds are oiled to improve clarity. Lab-grown versions are cleaner but lack the organic character some collectors value.
Pearl = cultured (human-assisted, always), not mined. Alexandrite = extremely rare natural; lab-grown versions available. Moonstone = adularescence effect; limited lab production. June has the most diverse options of any month.
High-quality natural rubies rival diamonds in price per carat. Heat treatment is industry standard — even for fine jewellery. Lab-grown rubies offer the same vivid red colour at accessible prices. Important: always check whether a stone is heat-treated if buying natural.
One of very few gems that exists in only one colour — its vibrant yellow-green comes from iron content. Peridot is naturally occurring and affordable. Some rare specimens come from meteorites, making them genuinely extraterrestrial.
Most people think blue, but sapphire comes in nearly every colour except red (that's ruby — same mineral, corundum, different name). Pink, yellow, and white sapphires are increasingly popular alternatives. Lab-grown versions are widely available.
Opal = unique play-of-colour effect; synthetic versions exist. Opals are delicate (Mohs 5.5–6.5) and need careful handling — not ideal for everyday rings. Tourmaline = incredibly colour-diverse; lab-grown is rare.
Most blue topaz sold commercially is actually colourless topaz that has been irradiated — this is standard and accepted. Citrine is often heat-treated amethyst. Both are affordable and widely available.
Tanzanite = found only in Tanzania; not commercially lab-grown. Turquoise = almost always stabilised, not true lab-grown. Zircon = a real gemstone (not cubic zirconia, which is synthetic); primarily natural.
April Birthstone: Why Lab-Grown Diamonds Are the Smarter Choice
If your birthday falls in April — or you're buying for someone who was born then — a lab-grown diamond gives you the same stone at a fraction of the cost. MadisonDia's April birthstone diamonds start from 1ct D/VVS1/Triple Excellent, fully IGI-certified. Every stone is inspected before dispatch and comes with a 30-day return guarantee.
Browse April Birthstone Diamonds →How Are Gemstones Verified? (Diamond vs Coloured Stones)
This is where many buyers are surprised: the verification process for diamonds and coloured gemstones works very differently.
Diamonds: Laser Inscription + Lab Report
Almost every certified diamond has a microscopic laser inscription on its girdle — a unique reference number that links it to an official grading report. You can check the report number against the lab's database before buying. This means a certified diamond is essentially unforgeable. Major labs for diamonds:
The leading lab for grading lab-grown diamonds. Reports cover colour, clarity, cut, carat, fluorescence, and more.
The world's most recognised diamond grading authority. GIA reports are accepted globally by buyers and insurers.
Coloured Gemstones: Laboratory Analysis
Most coloured stones don't have laser inscriptions. Instead, gemologists use a combination of physical and spectroscopic tests to identify and verify them:
Every gemstone bends light at a specific angle. RI measurement is a primary identification tool.
Natural stones have characteristic internal features — emerald "jardin," ruby silk needles, sapphire growth zoning.
UV-Vis and Raman spectroscopy identify the stone type and can detect treatments.
Trained gemologists examine inclusions, growth patterns, and surface features under high magnification.
When Does Gemstone Certification Actually Matter?
Here's something many retailers won't tell you: most commercial gemstones are not independently certified, and that's not necessarily a red flag. Certification costs money — sometimes a significant fraction of the stone's value — so for mass-market jewellery, sellers rely on supplier relationships and internal quality checks instead.
Even major online jewellery retailers don't provide independent certification on most coloured stones. This is industry standard — but it means you're relying heavily on the seller's reputation and return policy.
Where certification becomes genuinely important:
| Situation | Why Certification Matters | Recommended Lab |
|---|---|---|
| High-value diamonds (1ct+) | Confirms grade; protects resale value | IGI or GIA |
| Origin-sensitive gems (Burmese ruby, Colombian emerald) | Origin affects value dramatically; certificate confirms provenance | GRS or Gübelin |
| Treatment disclosure | Heat treatment, filling, oiling — must be disclosed; certificate documents this | GRS, GIA, CGL |
| Collector or investment-grade stones | Liquidity depends on certification at resale | GRS, Gübelin, GIA |
| Lab-grown diamonds | IGI confirms the stone is lab-grown and grades its quality | IGI |
For a deeper dive on how to read an IGI certificate — including which fields actually matter for sparkle and value — see our Ultimate Diamond Certification Guide.
FAQ — Birthstones and Gemstone Certification
Are birthstones scientifically classified?
No — birthstones are based on historical, cultural, and industry consensus, not scientific classification. The modern list was standardised by the American National Retail Jewelers Association in 1912 and has been updated several times since. This means the "official" birthstone for your month is really a tradition, not a rule — you can choose any stone that's meaningful to you.
Do all gemstones come with certification?
Most don't. Independent certification is most common for diamonds and high-value coloured stones. For everyday jewellery featuring smaller or less expensive gems, sellers typically rely on supplier quality controls rather than per-stone lab reports. If a stone's value is significant — say, a 1ct+ ruby or an alexandrite — always ask for independent certification before buying.
How do I know if a gemstone is natural or lab-grown?
The only reliable way is a report from a recognised gemological laboratory — GIA, IGI, GRS, or CGL. Visual inspection, even by an experienced gemologist, is often insufficient because modern lab-grown stones are chemically identical to natural ones. For diamonds specifically, the IGI report will clearly state whether a stone is lab-grown or natural. Never rely solely on a seller's word.
Are lab-grown gemstones real gemstones?
Yes. A lab-grown gemstone has the same chemical composition, crystal structure, and physical properties as its natural counterpart. A lab-grown emerald is chemically identical to a Colombian emerald; a lab-grown diamond is physically identical to a mined diamond. The difference is origin, not substance. The term "synthetic" in gemology means "created in a lab" — it does not mean fake or imitation.
Which birthstones have the best lab-grown alternatives?
Diamonds (April) have the most mature lab-grown market — full IGI certification, standardised grading, and significant price advantages. Lab-grown ruby (July) and sapphire (September) are also well-established. Alexandrite (June alternative) is available in lab-grown form and more affordable than natural versions, which are extraordinarily rare. For most other stones — amethyst, citrine, peridot, topaz — the natural versions are already affordable enough that lab-grown alternatives don't offer much practical benefit.
What should I check before buying a coloured gemstone?
Four things: (1) Treatment disclosure — has the stone been heat-treated, oiled, or filled? This is normal for many gems but affects value and care requirements. (2) Hardness — stones below Mohs 7 are too soft for everyday rings. (3) Certification — for any stone over a certain value threshold, independent verification. (4) Return policy — a generous no-questions return window signals a seller is confident in what they're selling.
Birthstones are a meaningful framework for choosing jewellery — but the right choice depends on more than just the month. Durability, treatment history, lab-grown availability, and certification all affect whether a stone is genuinely worth its price tag.
If your birthstone is diamond, you have the most transparent, standardised market of any gemstone to work with. Lab-grown diamonds offer the same grading rigour as mined stones, at prices that make a D/VVS stone accessible to most buyers. For all other stones, focus on reputable sellers, treatment disclosure, and — for higher-value purchases — independent certification from GRS, GIA, or IGI.
If you have questions about choosing a diamond for an April birthday — or any other occasion — our team is happy to help. Start with our diamond buying guide →
