Sapphires have long been associated with royalty, wisdom, and permanence. Best known for their deep blue colour, they are among the most sought-after gemstones in the world—and the birthstone for September.
But not all sapphires are blue.
Sapphires belong to the corundum family, and they occur in a wide range of colours, including pink, yellow, green, and the rare orange-pink known as padparadscha. These are often referred to as “fancy sapphires.”
So what actually makes one sapphire more valuable than another?
The Most Valuable Types of Sapphire
When people ask “what is the most valuable sapphire?”, they are usually referring to a combination of origin, colour, and rarity.
Kashmir Sapphires
Discovered in the 1880s in the Himalayas, Kashmir sapphires are considered the most valuable sapphires in the world.
They are known for a deep, velvety royal blue colour, caused by microscopic inclusions that soften the light. True Kashmir stones are exceptionally rare today and achieve some of the highest prices at auction.
Cornflower Blue Sapphires
“Cornflower blue” refers to a very specific shade—bright, vivid blue with a soft undertone.
Most commonly from Sri Lanka and Burma (Myanmar), these sapphires are among the most desirable for engagement rings due to their balance of intensity and elegance.
Padparadscha Sapphires
Padparadscha sapphires are among the rarest gemstones on the market.
Their colour sits between pink and orange, often compared to a lotus blossom (the name comes from Sanskrit). Fine examples are extremely difficult to source and command very high prices.
What Determines a Sapphire’s Value?
If you’re wondering “how are sapphires graded?” or “what should I look for when buying a sapphire?”, it comes down to the same core principles used across gemstones:
Colour
Colour is the single most important factor.
Sapphires are evaluated based on hue, tone, and saturation. The most valuable stones have strong, vivid colour without appearing too dark or too pale. Royal blue, cornflower blue, and padparadscha are among the most prized.
Clarity
Sapphires almost always contain inclusions, but the best stones appear “eye-clean.”
Interestingly, some inclusions (like the silk in Kashmir sapphires) can actually increase value by enhancing the stone’s appearance.
Cut
Cut affects how light moves through the stone.
Unlike diamonds, sapphires are often cut to preserve weight rather than maximise brilliance. A well-cut sapphire will still appear lively, with even colour and minimal zoning.
Carat Weight
Larger sapphires are significantly rarer.
Fine stones over five carats—especially in blue or padparadscha—are highly sought after and often seen at Sotheby’s and Christie’s.
(A useful reference: a one-carat sapphire typically appears smaller than a one-carat diamond due to its density.)
Are Sapphires Durable Enough for Everyday Wear?
Yes—sapphires are one of the best gemstones for daily wear.
They rank 9 on the Mohs hardness scale (just below diamonds), making them highly resistant to scratching. They are also chemically stable, meaning they won’t easily dull or lose their polish over time.
This is why sapphire engagement rings have remained popular for centuries.
Sapphire Jewellery and Bespoke Design
If you’re looking for a sapphire engagement ring, antique sapphire jewellery, or a bespoke sapphire piece, the key is sourcing the right stone.
The difference between an average sapphire and an exceptional one is often subtle on paper, but very obvious in person.
If you’d like help sourcing a sapphire or designing a bespoke piece, you can contact us at info@stapyltonsmith.com.
Guillaume is a trained gemmologist (Gem-A) and works directly with clients to source stones that are genuinely worth owning.
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