When most think of August’s birthstone, the vibrant green of peridot likely comes to mind. Yet August is one of only three months gifted with a trio of birthstones — peridot, spinel, and sardonyx — each distinct in beauty, composition, and historical allure. At Prins & Prins, we see these stones not just as adornments, but as storied treasures, each carrying centuries of significance and a world of gemological intrigue.
In this behind-the-scenes guide, our expert gemologist shares professional insights into what makes these three gems truly shine — from evaluating colour and clarity to understanding ethical sourcing and selecting the right cut. Whether you are an August baby, a curious collector, or seeking a meaningful gift, this article will equip you with the knowledge to select a stone with confidence and connoisseurship.
Peridot – The Stone of Strength and Renewal
Few gemstones evoke the essence of late summer quite like peridot. With its signature lime to olive-green hues, peridot is a variety of the mineral olivine, formed deep within the Earth’s mantle and often delivered to the surface through volcanic activity.
What Makes a Peridot Exceptional?
From a gemologist’s perspective, the finest peridots exhibit a pure, vibrant green with slight golden undertones, free of brown or yellow hues. Clarity is equally important: although minor inclusions are common, the most valuable stones have excellent transparency with no eye-visible imperfections.
Equally critical is the cut, which should maximise brilliance. At Prins & Prins, we favour precision cutting that enhances peridot’s natural luminosity — cushion, oval, and round cuts are particularly effective in showcasing the gem’s inner light.
Origin & Ethics
Top-quality peridot often hails from Pakistan’s Kashmir region or Arizona, yet ethically sourced peridot from lesser-known localities is becoming increasingly sought after. Prins & Prins takes pride in ensuring that all our peridot is responsibly sourced, adhering to traceability and fair-labour standards.
Spinel – The Underrated Sparkle
Once mistaken for ruby — including in Britain’s Crown Jewels — spinel is finally earning its rightful place in the gemological spotlight. Its exceptional brilliance, broad colour range (from vivid red to cool lavender, cobalt blue, and hot pink), and durability make it a prized yet often underappreciated gemstone.
Spinel’s Hallmarks of Quality
When evaluating spinel, colour is king. The most valuable stones exhibit a strong saturation, with no grey or brown modifiers. Red spinel is historically the most prized, but cobalt-blue and neon pink varieties are quickly gaining favour among collectors and designers alike.
Clarity is another key consideration. Spinel typically forms in relatively clean crystals, so the finest specimens are eye-clean, meaning they contain no visible inclusions.
One of the greatest appeals of spinel is its hardness — an impressive 8 on the Mohs scale — which makes it ideal for everyday wear in rings, earrings, and pendants.
Why We Love It
Spinel is a gemologist’s gem — durable, radiant, and wonderfully versatile. It is also increasingly rare, particularly in fine colours, and is often seen as a connoisseur’s choice. Its lack of treatment or enhancement adds to its appeal, offering clients natural beauty untouched by modern interference.
Sardonyx – The Timeless Layered Beauty
The oldest of August’s birthstones, sardonyx has been used in jewellery and intaglios since antiquity. Composed of alternating bands of sard (a reddish-brown chalcedony) and onyx (a black or white variant), sardonyx is a striking, layered stone known for its earthy elegance and symbolic depth.
What Gemologists Look For
The most valuable sardonyx exhibits distinct, contrasting layers, usually in bold combinations of white and reddish-brown. Uniformity and contrast are essential — the sharper the boundary between colours, the more visually striking the stone.
Polish is especially important in sardonyx, as it enhances its natural layering and brings out the smooth, waxy lustre typical of chalcedony gemstones.
Historical and Symbolic Appeal
Sardonyx has long been associated with courage, protection, and eloquence, making it a traditional choice for signet rings and carved cameos. Today, it’s appreciated for its retro appeal and distinctive aesthetic, particularly in vintage-inspired jewellery.
A Gemologist’s Tips for Choosing August Birthstones
Selecting a gemstone is a highly personal experience, but understanding gemological quality can help you choose a piece that endures in both value and sentiment.
Here are a few professional tips:
- Start with colour: It’s often the first thing the eye notices. Look for stones with vibrant, even saturation and minimal zoning.
- Inspect the clarity: While inclusions can be expected in some gems (like peridot), excessive cloudiness can diminish brilliance.
- Prioritise cut: A well-cut gem will sparkle evenly and feel well-proportioned when worn.
- Ask about origin and ethics: At Prins & Prins, we go beyond aesthetics to ensure that our gemstones are sourced responsibly and ethically.
- Consider the wearer: Peridot’s fresh glow suits warm skin tones, spinel’s colour spectrum suits many moods and complexions, and sardonyx makes a bold statement with its graphic contrast.
For those seeking bespoke design, our in-house team of gemologists and master goldsmiths will guide you through selecting, setting, and styling a gemstone that tells your story with timeless elegance.
Explore August’s Birthstone Collection
Whether you’re celebrating a birthday, marking Women’s Month, or simply drawn to the unique charm of these August stones, our curated selection of fine gemstone jewellery is designed to captivate.
From vibrant peridot rings to rare spinel earrings and bold sardonyx pendants, each piece is crafted with the precision and heritage Prins & Prins is known for.Explore our full range of ethically sourced, expertly crafted designs here:
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