September Birthstone · 5th and 45th Anniversary
The most iconic September birthday gift — and one of the most storied stones on earth.
Blue sapphire has been the birthstone of September for centuries — and unlike stones chosen for trend, it was chosen for meaning. It is also the traditional gift for 5th and 45th wedding anniversaries, a stone that has symbolized wisdom, loyalty, and faithfulness across cultures and royal houses for generations.
The Gemstone
Blue Sapphire
Blue sapphire is one of the most celebrated gemstones in fine jewelry history, known for its deep royal blue color and exceptional durability.
As a member of the corundum family, sapphire ranks 9 on the Mohs hardness scale, making it an excellent choice for engagement rings and heirloom jewelry.
Lab-Grown Blue Sapphire
Lab-grown blue sapphire is chemically, physically, and optically identical to natural sapphire. Grown under controlled conditions, it offers:
• Exceptional clarity
• Rich, consistent color
• Larger size availability
• Accessible luxury
Each sapphire is selected to high jewelry standards for saturation, brilliance, and balanced cut.
"Prestige is not a label. It is 30 years of knowing the difference."
Pel & Co. — Los Angeles
FAQ
Why choose blue sapphire?
Blue sapphire symbolizes:
• Loyalty
• Wisdom
• Devotion
• Strength
Its timeless appeal has made it one of the most iconic engagem
What is Ceylon Blue and why does it matter?
Ceylon Blue is the most prized color in blue sapphire — a velvety, deep blue with a luminosity that comes from the specific geological conditions of Sri Lanka, historically known as Ceylon. It is the color of Princess Diana's ring, now worn by Kate Middleton, and the standard against which all blue sapphires are measured.
What makes it distinctive is not just the hue — it is the way light moves through the stone. A true Ceylon Blue reads differently in daylight than under candlelight. It does not flatten. It does not grey. It remains alive in every light condition.
At Pel & Co., Ceylon Blue is our only standard. Every blue sapphire in our Prestige collection is selected specifically for this quality — not cut to approximate it, but chosen because it genuinely achieves it.
Why is a blue sapphire engagement ring a strong choice?
Sapphire ranks 9 on the Mohs hardness scale — second only to diamond. It is one of the few colored gemstones genuinely suited for daily wear over decades without compromise.
But durability is not the reason to choose a blue sapphire. The reason is meaning. Blue sapphire has represented loyalty, wisdom, and commitment across cultures and centuries. It was the stone of choice for royal engagements long before diamonds became the default — and it remains the most enduring colored stone choice for couples who want something that carries weight beyond the moment.
A blue sapphire engagement ring does not follow a trend. It predates most of them.
Does carat weight determine the size of a gemstone?
Carat measures a gemstone’s weight — not its physical size.
Because different gemstones have different densities, stones of the same carat weight can vary in visible dimensions. For example, one gemstone may appear slightly larger or smaller than another of equal carat weight depending on its material and cut proportions.
For the most accurate understanding of size, we recommend referencing the listed millimeter measurements (length × width), which reflect how the gemstone will appear when worn.
Pel & Co provides precise dimensions for every stone to ensure clarity and confidence in your selection.
What makes one blue sapphire better than another?
Color is the primary value driver — specifically the combination of hue, saturation, and tone. The ideal blue sapphire is vivid without being dark, deep without being inky, and consistent across light sources without greying or shifting.
Cut is the second driver. A poorly cut stone hides its color in the depth and shows a dark window face-up. A well-cut stone carries its color across the full face of the stone. This is why we cut in-house — because the cut decision determines how much of the stone's actual quality is visible.
The third driver is clarity. Eye clean is the standard. Inclusions that interrupt light transmission diminish color performance — regardless of how well the stone is cut.
At Pel & Co., every stone is evaluated against all three. Stones that pass two out of three don't make it.
Can I have a blue sapphire set into a custom design?
Yes — and for many clients, this is where the piece becomes something entirely different from what they could find anywhere else.
Our Custom Made Simple process allows you to bring an idea, a sketch, or simply a preference — and we'll design a setting built around your specific sapphire. The setting is made in-house in our Los Angeles workshop. We design from the stone outward, which means the proportions, the profile, and the way the diamond accents are placed are all calibrated to that specific stone.
Complimentary gemstone up to $500 value included on custom orders.
Have Questions?
We’re Here to Help
Choosing fine jewelry is a meaningful decision, and we’re here to make it effortless. Whether you have questions about gemstones, customization, or design details, our team is happy to guide you—no pressure, just thoughtful support.
Because your jewelry should feel as special as the moment it marks.
Contact us for a complimentary consultation. We’re available by phone, video, or in person to help bring your vision to life.