This natural 𝐒𝐭𝐚𝐫 𝐒𝐚𝐩𝐩𝐡𝐢𝐫𝐞 weighs 𝟑.𝟗𝟎 𝐜𝐭 and is fashioned as a distinctive 𝐡𝐞𝐚𝐫𝐭-𝐬𝐡𝐚𝐩𝐞𝐝 𝐜𝐚𝐛𝐨𝐜𝐡𝐨𝐧, measuring approximately 𝟏𝟎.𝟓 × 𝟕.𝟓 × 𝟒.𝟐 𝐦𝐦. The gemstone displays a deep brownish-black body colour with an opaque appearance and a smooth domed surface designed to reveal its natural asterism.
Under a concentrated light source, the stone produces a clearly visible 𝐬𝐢𝐱-𝐫𝐚𝐲𝐞𝐝 𝐬𝐭𝐚𝐫, with warm golden-white rays radiating from a bright central point. As the stone or light source is moved, the star shifts across the cabochon surface, confirming the dynamic optical character expected from natural star Sapphire.
Asterism in Sapphire is produced by light reflecting from directionally oriented microscopic inclusions within the Corundum. In this specimen, these aligned internal structures create the distinct star effect while also contributing to the opaque body character. The exact mineral composition of the star-forming inclusions is not assigned without analytical confirmation.
The brownish-black body colour provides strong contrast with the brighter star, allowing the optical effect to become especially pronounced under direct point illumination. Under softer or diffuse lighting, the star becomes less intense and the deep body colour becomes the dominant visual characteristic.
The heart-shaped cabochon has a rounded dome that supports the development of the star across the surface. Natural internal structures and subtle surface or growth-related features may be present and form part of the individual character of this untreated gemstone.
Sapphire is the gem variety of Corundum, Al₂O₃, and has a hardness of 9 on the Mohs scale, making it one of the most durable natural gemstones used in jewellery. The recorded origin of this specimen is 𝐓𝐡𝐚𝐢𝐥𝐚𝐧𝐝.
This Star Sapphire is 𝐮𝐧𝐡𝐞𝐚𝐭𝐞𝐝 𝐚𝐧𝐝 𝐮𝐧𝐭𝐫𝐞𝐚𝐭𝐞𝐝, preserving its natural brownish-black colour, opaque internal structure and distinctive six-rayed asterism.
With its 3.90 ct weight, unusual heart-shaped cabochon, deep brownish-black body and clearly visible golden-white star, this natural Thai Star Sapphire offers a strongly individual combination of optical phenomenon, durability and natural gemstone character.
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