Sapphire: Meaning, Colour, Properties & Jewellery Guide

What Is Sapphire?

Sapphire is a variety of the mineral corundum, one of the hardest naturally occurring substances on Earth. Corundum is composed primarily of aluminium oxide, and its exceptional hardness and durability make it highly prized for use in fine jewellery.

The relationship between sapphire and ruby is straightforward: both are forms of corundum. Red corundum is classified as ruby, whilst gem-quality corundum in all other colours is generally classified as sapphire. This means that sapphire can occur in a wide range of colours, not just the famous blue for which it is best known.

What Colour Is Sapphire?

Whilst sapphire is most famous for its rich blue colour, it naturally occurs in a remarkable variety of hues. Blue sapphires range from pale cornflower blue to deep velvety midnight tones, with the most prized examples displaying a vivid, saturated blue.

Beyond blue, sapphires are found in pink, yellow, green, orange, purple and white, as well as rare colour-change varieties. These are often referred to as fancy sapphires. Pink sapphires, for example, have become increasingly popular in engagement rings, whilst yellow and orange sapphires offer warm, vibrant alternatives to traditional blue.

Padparadscha sapphires, a rare variety displaying a delicate blend of pink and orange, are particularly sought after and command premium prices. White sapphires, which are colourless, are sometimes chosen as an alternative to diamonds, though they have different optical properties.

What Colour Is Sapphire?

Whilst sapphire is most famous for its rich blue colour, it naturally occurs in a remarkable variety of hues. Blue sapphires range from pale cornflower blue to deep velvety midnight tones, with the most prized examples displaying a vivid, saturated blue.

Beyond blue, sapphires are found in pink, yellow, green, orange, purple and white, as well as rare colour-change varieties. These are often referred to as fancy sapphires. Pink sapphires, for example, have become increasingly popular in engagement rings, whilst yellow and orange sapphires offer warm, vibrant alternatives to traditional blue.

Padparadscha sapphires, a rare variety displaying a delicate blend of pink and orange, are particularly sought after and command premium prices. White sapphires, which are colourless, are sometimes chosen as an alternative to diamonds, though they have different optical properties.

What Gives Sapphire Its Colour?

The colour of sapphire is determined by trace elements present within the corundum crystal structure during its formation. Pure corundum is colourless, but the presence of small amounts of certain elements creates the beautiful colours we associate with sapphire.

Blue sapphires owe their colour primarily to the presence of iron and titanium. Pink sapphires contain chromium, whilst yellow sapphires are coloured by iron. The specific combination and concentration of these trace elements, along with the conditions under which the crystal formed, determine the final colour and intensity of each sapphire.

How Hard Is Sapphire?

Sapphire ranks 9 on the Mohs scale of mineral hardness, making it the second hardest naturally occurring gemstone after diamond, which ranks 10. This exceptional hardness means that sapphire is highly resistant to scratching and abrasion, making it an excellent choice for jewellery that is worn frequently.

In practical terms, sapphire's hardness means it can withstand the rigours of everyday wear better than many other gemstones. This is one reason why sapphire is such a popular choice for engagement rings and other pieces of jewellery that are worn daily.

However, it is important to note that hardness does not make a gemstone completely indestructible. Sapphires can still chip or fracture if subjected to a sharp blow, particularly along natural crystal planes. Proper care and sensible handling will help ensure your sapphire jewellery remains beautiful for generations.

Where Are Sapphires Found?

Sapphires are mined in various locations around the world, each producing stones with distinctive characteristics. Some of the most notable sapphire-producing regions include:

• Sri Lanka: Historically one of the most important sources, known for producing fine blue sapphires as well as a wide range of fancy colours, including the rare padparadscha sapphire.
• Myanmar (Burma): Renowned for producing sapphires with rich, velvety blue colour, often with excellent clarity.
• Madagascar: A significant modern source producing sapphires in a variety of colours, including fine blues and pinks.
• Australia: Known for producing darker blue and green sapphires, as well as parti-coloured stones.
• Thailand: An important source and cutting centre, producing darker blue sapphires.
• Kashmir: Historically famous for producing some of the world's most prized blue sapphires, characterised by a velvety appearance. Stones from this region are extremely rare and highly valued.
• Montana, USA: Produces sapphires in a range of colours, particularly blues and greens.

Whilst origin can influence a sapphire's characteristics and market value, it is important to understand that origin alone does not determine quality. A sapphire should be evaluated on its individual merits, including colour, clarity, cut and overall appearance.

Natural, Lab-Grown and Treated Sapphires

Natural Sapphires

Natural sapphires are formed over millions of years deep within the Earth under conditions of extreme heat and pressure. Each natural sapphire is unique, with its own combination of colour, clarity and inclusions that tell the story of its geological formation.

Laboratory-Grown Sapphires

Laboratory-grown sapphires are created in controlled environments using advanced technology that replicates the natural formation process. These sapphires have the same chemical composition, crystal structure and physical properties as natural sapphires.

Laboratory-grown sapphires are typically less expensive than natural sapphires of comparable quality and can be produced with excellent colour and clarity. They represent a valid choice for those seeking the beauty and durability of sapphire at a more accessible price point.

Treated Sapphires

Heat treatment is widely used within the gemstone industry to improve the colour and clarity of natural sapphires. The vast majority of sapphires available today have been heat-treated. This process involves heating the stones to high temperatures, which can enhance colour saturation, improve clarity and create a more uniform appearance.

Heat treatment is a stable and permanent enhancement that does not affect the durability of the sapphire. It is considered an accepted practice within the industry, though treatments should always be disclosed by reputable jewellers.

Untreated natural sapphires with fine colour and clarity are rare and typically command premium prices. Other treatments, such as diffusion or fracture filling, are less common and should always be clearly disclosed.

What Determines Sapphire Quality?

Evaluating sapphire quality involves considering several important factors. No single characteristic determines quality on its own; rather, it is the combination of these elements that defines a sapphire's overall appeal and value.

Colour

Colour is often considered the most important factor in determining a sapphire's quality and value. The most prized blue sapphires display a vivid, saturated blue that is neither too dark nor too light, with good colour distribution throughout the stone. For fancy sapphires, pure, saturated colours without muddy or greyish tones are generally preferred.

Clarity

Clarity refers to the presence or absence of inclusions and blemishes within the sapphire. Whilst most sapphires contain some inclusions, stones with better clarity and fewer visible inclusions are generally more valuable. However, some inclusions, such as fine silk-like rutile needles, can actually enhance a sapphire's appearance by creating a desirable velvety quality.

Cut

A well-executed cut maximises a sapphire's colour, brilliance and overall beauty. The cut should be proportioned to allow light to reflect properly through the stone, enhancing its natural colour and sparkle. Poorly cut sapphires may appear dark or lifeless, even if the rough material was of good quality.

Carat Weight

Larger sapphires are rarer than smaller ones, and price per carat typically increases with size. However, a larger sapphire is not necessarily more valuable than a smaller one if it lacks good colour, clarity or cut.

Origin

Whilst origin can influence value, particularly for sapphires from historically significant sources such as Kashmir or Burma, it should be considered alongside other quality factors. A sapphire from a less renowned source with excellent colour and clarity may be more desirable than a poorly coloured stone from a famous location.

Treatments

Whether a sapphire is untreated or has undergone enhancement affects its value. Untreated sapphires with fine colour and clarity are rare and command premium prices, whilst heat-treated sapphires represent the majority of the market and offer excellent value.

Sapphire in Jewellery

Sapphire's combination of exceptional beauty, durability and symbolic meaning makes it one of the most versatile gemstones for fine jewellery. Its hardness and resistance to scratching make it particularly well-suited to pieces that are worn frequently.

Engagement Rings

Sapphire has a long and distinguished history in engagement rings, perhaps most famously exemplified by the sapphire and diamond ring worn by Diana, Princess of Wales, and now by Catherine, Princess of Wales. Blue sapphire engagement rings offer a distinctive alternative to traditional diamond solitaires, whilst pink, yellow and other fancy sapphire colours provide even more personalised options.

Rings

Beyond engagement rings, sapphires are popular in dress rings, eternity rings and statement cocktail rings. Their durability makes them suitable for everyday wear, whilst their range of colours allows for creative and individual designs.

Earrings

Sapphire earrings, whether simple studs or elaborate drops, add a touch of elegance and colour. Blue sapphires pair beautifully with diamonds, whilst fancy sapphires can create vibrant, eye-catching designs.

Necklaces and Pendants

Sapphire pendants and necklaces range from delicate solitaire designs to elaborate multi-stone creations. A sapphire pendant can serve as a meaningful birthstone gift or a timeless addition to any jewellery collection.

Bracelets

Sapphire bracelets, whether featuring a single statement stone or a continuous line of smaller sapphires, combine beauty with the durability needed for a piece worn on the wrist.

How to Care for Sapphire Jewellery

Whilst sapphire is one of the most durable gemstones, proper care will help ensure your sapphire jewellery remains beautiful for years to come.

Regular Cleaning

Sapphire jewellery can be cleaned at home using warm water, a small amount of mild washing-up liquid and a soft brush. Gently brush the sapphire and setting, then rinse thoroughly with clean water and dry with a soft, lint-free cloth. This simple routine will help maintain your sapphire's brilliance.

Avoid Harsh Chemicals

Whilst sapphire itself is resistant to most chemicals, the metal settings and any other gemstones in your jewellery may be more vulnerable. Remove sapphire jewellery before using household cleaning products, swimming in chlorinated water or applying cosmetics, perfumes or hairspray.

Safe Storage

Store sapphire jewellery separately from other pieces to prevent scratching. Whilst sapphire is hard enough to scratch most other gemstones and metals, it can still be damaged by impact. A fabric-lined jewellery box with individual compartments is ideal.

Professional Maintenance

Have your sapphire jewellery inspected periodically by a professional jeweller, particularly if it is worn frequently. They can check that settings remain secure and provide professional cleaning to restore brilliance.

Special Considerations

Jewellery with complex settings, multiple gemstones or antique pieces may require more specialised care. If you are unsure about the best way to care for a particular piece, consult a professional jeweller for guidance.