Star sapphires have to be the most magical of natural gemstones. Watching the star wander just under the silky surface of a cabochon cut sapphire is absolutely mesmerising and deeply delightful. The star phenomena, also known as asterism is a rare, naturally occurring curiosity found in some cabochon cut sapphires. The asterism effect is formed by the arrangement of tiny needle-like inclusions inside the stone, which also give the gemstone its silky appearance. Under a direct light source – like the sun or a light bulb – the star will appear and travel over the surface of the ring in response to the light source. I have seen up to 3 stars appear in this sapphire. The stars in star sapphires can be small and wobbly, or large with well defined straight rays like the one in this vintage ring, which is of the highest quality.
This unisex signet ring is designed to support the incredible 7.5 carat blue star sapphire. It’s a comfortable ring to wear, with a smooth flat-rounded band that sweeps up to a deep rub-over oval bezel setting.
You can see a short video of this ring in natural light on my Instagram @secret_histories, or online here.
Manufacture:
Modelled in 9ct yellow gold, this signet style ring features a 12mm x 10mm 7.5 carat natural blue star sapphire cabochon, held in a closed back rub-over setting. The ring is hallmarked to the underside with the makers mark MK and 9ct.
The face of the ring measures 14.7mm x 12.5mm. The bezel tapers to a wide rounded band, measuring 3.32mm at the back of the band.
Sits 5.76mm high on the finger.
Weighs 5.21 grams
The star sapphire cabochon has been verified as natural by an independent gemologist.
This ring is accompanied by a recent insurance appraisal for $4415 Australian dollars.
Size:
Size R1/2 or 9 on the mandrel, will fit a size R or 8.5 finger.
Somewhat resizable. We do offer a resizing service, please get in touch for a quote.
Condition:
Excellent. There are some small dents on the inside of the band, which are a minor cosmetic fault and mentioned here for transparency. The sapphire is free from chips or scratches. Ready for immediate and everyday wear.
Silky, natural, oval shaped 7.5 carat blue star sapphire cabochon set into a 9ct signet ring, circa 1950. The “star” or asterism is pronounced under a direct light source – the star has 6 long straight rays, a very high quality example.
The signet style ring holds the stone in a rub-over closed back setting, makers mark MK and 9ct for 9ct gold is hallmarked to the underside. Weighs 5.21 grams.
Size R1/2 or 9 on the mandrel, will fit a size R or 8.5 finger.
