16.64 Ct. Yellow Sapphire Crystal from Ceylon (Sri Lanka)

This semi-transparent yellow sapphire weighs 16.64 carats and measures 27.10 by 10.00 by 8.10 millimeters, presented in a various shape with a rough crystal cut, and an excellent polish. The medium color intensity places this stone in a desirable middle range where hue and saturation are balanced for versatile use in jewelry, offering warm golden tones without veering into overly pale or overly intense color. Clarity is described as semi-transparent, which for sapphire indicates the presence of internal inclusions and growth features that are visible under magnification and may be perceptible to the eye, but that do not compromise the overall structural integrity. The combination of a rough crystal cut and excellent polish means the cutter retained more of the natural crystal form while applying precise surface finishing to enhance luster, so the stone displays a pleasing reflective quality despite its retained crystal character. Importantly, this sapphire has undergone no enhancement, no heat treatment or other modification, which is a critical factor for an educated buyer because untreated sapphires, especially at this size and from a renowned origin, carry a premium for rarity and natural appeal.

Origin is Ceylon, Sri Lanka, a historically significant source for yellow and blue sapphires, and provenance contributes materially to market valuation and collector interest. As corundum, sapphire has a Mohs hardness of 9, which confers excellent durability for daily wear when properly set, and the 16.64 carat weight combined with the elongated dimensions offers flexibility for bespoke designs from a single dramatic solitaire to a custom statement piece with complementary accent stones. For an informed purchaser, the lack of enhancement, the clear provenance to Ceylon, and the substantial carat weight make this example particularly attractive for both investment-minded collectors and jewelers seeking a natural statement gem. We recommend independent gemological documentation to accompany the purchase for full market transparency, advice on secure bezel or custom prong settings to protect the elongated profile, and standard care involving warm soapy water and a soft brush for cleaning. The Natural Sapphire Company offers this specimen as part of our curated inventory, and our team can provide additional imaging, magnified inclusion maps, and guidance on certification so you can assess cut, clarity, and origin with confidence.