Purple Sapphire: the purple variety of corundum
Appearance & Properties
Purple sapphire is the purple variety of corundum, a crystalline form of aluminium oxide. Its colour can range from lilac and violet to plum, often with pink, blue or grey undertones. Trace elements such as iron, chromium, titanium and vanadium influence the colour. The stone is usually transparent to translucent and may show pleochroism, meaning that different colours or intensities appear when it is viewed from different directions. Fine inclusions can create a soft, silky appearance; in rare cases, oriented inclusions produce asterism, or a star effect. With a Mohs hardness of 9, sapphire is highly resistant to scratching. It has no true cleavage, although strong blows can still cause fractures.
History & Discovery
Purple sapphire belongs to the long-established sapphire tradition, although earlier writers often used “sapphire” for several blue or blue-looking stones before modern mineral identification became precise. The word is commonly linked to the ancient Greek sappheiros and related older terms, though the original stone meant by the name remains debated. Corundum itself was recognized as a distinct mineral as European mineralogy developed in the eighteenth and nineteenth centuries. Purple varieties were subsequently classified by colour rather than given a separate mineral species name. Modern gemmology distinguishes natural purple sapphire from laboratory-created corundum and from treated material, while the basic mineral composition remains the same.
Occurrences
Important sources of purple sapphire include Sri Lanka, especially the gem-bearing areas around Ratnapura, as well as Madagascar and Tanzania. Purple stones have also been reported from Myanmar and Vietnam, and corundum deposits in other countries may occasionally yield comparable colours. Many deposits produce crystals in alluvial gravels, where weathering has released the durable corundum from its host rock. The appearance of material can differ considerably between localities, and colour alone is not a dependable way to determine origin. A stone sold as purple sapphire should therefore not be assumed to come from any particular deposit without reliable documentation and, where appropriate, an independent laboratory report.
Famous Examples & Interesting Facts
There is no universally recognized, securely documented “famous purple sapphire” comparable to celebrated blue sapphires such as the Star of India. Purple sapphire is nevertheless interesting for several reasons. Its colour may result from a complex interaction of trace elements rather than from a single colouring agent. Some stones show colour zoning, with purple alongside pink, blue or nearly colourless areas in the same crystal. Natural rutile inclusions can create a silky appearance or, when aligned in three directions, a star. Synthetic corundum has been produced commercially since the early twentieth century, making laboratory-created purple sapphire an important part of gemmological history. Careful testing is needed to separate it from treated natural sapphire and imitations.
Jewellery & Use
Purple sapphire is suitable for rings, earrings, pendants and bracelets, and its strong hardness makes it practical for regular wear. Facets are commonly arranged in oval, cushion, round, pear or mixed cuts to display colour and brilliance; cabochons are used when inclusions or asterism are the main attraction. Natural sapphire may be heat-treated to improve or alter colour, while laboratory-created sapphire has the same basic hardness and composition as natural corundum. Glass, synthetic spinel and other materials can imitate its appearance but differ in properties. Clean purple sapphire with warm water, mild soap and a soft brush. Avoid sudden temperature changes and harsh chemicals, and ask a jeweller before using ultrasonic or steam cleaning, particularly if fractures or filled features are present.
Symbolism, Astrology & Tradition
Sapphire has long been associated in symbolism with loyalty, dignity, wisdom and spiritual reflection, although these meanings are cultural traditions rather than scientific properties. In European birthstone lists, sapphire is commonly linked with September. Zodiac associations vary: modern jewellery and astrology sources sometimes connect sapphire with Virgo, Libra or Taurus, but there is no universal system. Purple sapphire may be given additional symbolic meanings inspired by the colour purple, such as imagination, transformation or royal status. In contemporary crystal and esoteric practices, it is sometimes described as a stone for intuition or inner calm. These are beliefs and symbolic interpretations, not medically or scientifically established effects.