Ceylon Sapphire

Sapphire from Sri Lanka is celebrated above all for its blues, which are often described in the trade as bright, lively and medium in tone rather than dark or inky. The island also produces the full spectrum of fancy sapphires: pink, yellow, violet, green, colourless and the rare orange-pink padparadscha. Colour in sapphire comes from trace elements within the corundum crystal, iron and titanium produce blue, while chromium contributes pink and red tones. Because Sri Lankan sapphires frequently show lighter, cleaner colour than material from some other origins, they are prized for their brilliance and transparency. Colour preference is ultimately personal, and stones should be judged individually rather than by origin alone.

Quality in Ceylon sapphire is assessed on colour, clarity, cut and carat weight, with colour usually the dominant factor. The most sought-after blues are vivid and evenly saturated without being overly dark, retaining their liveliness under most lighting. Clarity expectations for sapphire are more forgiving than for diamond, but eye-visible inclusions that affect transparency reduce value. A well-proportioned cut brings out brilliance and avoids windowing, where light passes straight through a shallow stone. For significant purchases, a report from a recognised gemmological laboratory describing the stone's identity, treatments and, where possible, geographic origin is strongly recommended, since origin and treatment status materially affect value.

Heating is the most common treatment applied to sapphire worldwide, including Sri Lankan material, and has been practised in the country for a long time. Controlled heating can improve colour and clarity and is generally accepted in the trade when disclosed. Other treatments occur and are treated very differently by the market: lattice (beryllium) diffusion alters colour with an introduced element, and fracture filling improves apparent clarity. Under international trade standards, notably CIBJO's Gemstone Book, one of the Blue Book standards published by the World Jewellery Confederation, treatments should be disclosed at every stage of sale, and consumer-protection law in many jurisdictions separately requires material facts such as treatment to be disclosed. Undisclosed treatment is a serious breach of trade practice. Unheated sapphires with fine colour command a premium, so laboratory confirmation of treatment status matters for any important stone.

Sri Lanka's gem deposits are largely secondary, meaning sapphires are recovered from alluvial gravels, known locally as illam, rather than from the host rock in which they formed. Traditional pit and tunnel mining, much of it small-scale and licensed, remains characteristic of the industry. Ratnapura, whose name means City of Gems, is the best-known centre, with further production from areas such as Elahera, Balangoda and Rakwana. The island's long mining history and continuing output have made Ceylon a benchmark origin for sapphire, and laboratories can often support a Sri Lankan origin opinion based on a stone's inclusions and chemistry.

Sapphire is one of the most durable gemstones available, with a Mohs hardness of 9 and no cleavage, making it well suited to everyday jewellery including engagement rings. Clean sapphires with warm soapy water and a soft brush, rinsing thoroughly. Ultrasonic and steam cleaning are generally safe for untreated and heated stones, but should be avoided for fracture-filled sapphires, where the filler can be damaged. Avoid knocking the stone against hard surfaces, since even sapphire can chip on exposed facet edges. Store pieces separately so sapphires do not scratch softer gems in the same box, and have settings checked periodically by a jeweller.