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10+ Ct Natural Unheated Color Changing Sapphire — Sri Lanka

At over 10 carats, this sapphire displays true color change — appearing blue in daylight or fluorescent light and shifting toward a violet-purple tone under incandescent or warm light. This optical phenomenon is caused by trace elements interacting differently with different light sources, and it's one of the rarer effects seen in natural corundum.

Color change sapphire of any size is uncommon, and a stone of over 10 carats displaying a clear, convincing shift is genuinely scarce; the effect must be strong enough to read clearly to the eye, which most color-change material does not achieve at this scale. This stone is completely untreated, so the color and the change itself are entirely natural, sourced from Sri Lanka, a classic origin for fine color-change sapphire.

Sapphire ranks 9 on the Mohs scale, second only to diamond, making this an exceptionally durable choice for a museum-quality collection piece or a truly one-of-a-kind jewelry commission.

• Type: Natural Sapphire (Color Change)

• Treatment: Unheated

• Weight: 10+ Cts.

• Color: Blue to Violet-Purple (Color Change)

• Origin: Sri Lanka


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At over 10 carats, this sapphire displays true color change — appearing blue in daylight or fluorescent light and shifting toward a violet-purple tone under incandescent or warm light. This optical phenomenon is caused by trace elements interacting differently with different light sources, and it's one of the rarer effects seen in natural corundum.

Color change sapphire of any size is uncommon, and a stone of over 10 carats displaying a clear, convincing shift is genuinely scarce; the effect must be strong enough to read clearly to the eye, which most color-change material does not achieve at this scale. This stone is completely untreated, so the color and the change itself are entirely natural, sourced from Sri Lanka, a classic origin for fine color-change sapphire.

Sapphire ranks 9 on the Mohs scale, second only to diamond, making this an exceptionally durable choice for a museum-quality collection piece or a truly one-of-a-kind jewelry commission.

• Type: Natural Sapphire (Color Change)

• Treatment: Unheated

• Weight: 10+ Cts.

• Color: Blue to Violet-Purple (Color Change)

• Origin: Sri Lanka