Pearls – A Natural Treasure
Pearls are among the oldest and most treasured materials in jewellery. For centuries, their rarity made them exceptionally valuable, and they have long been associated with royalty, status and adornment.
Unlike gemstones formed within the Earth, pearls are created inside living molluscs such as oysters and mussels. They emerge with their natural surface already formed, without the cutting and polishing typically required to reveal the beauty of a gemstone.
A pearl forms as layers of nacre gradually build around an irritant or an introduced nucleus. These layers create the pearl’s characteristic lustre – the way light is reflected from and within its surface. Lustre is one of the most important factors when assessing the quality and beauty of a pearl.
Natural and Cultured Pearls
Natural pearls form without human intervention and are exceptionally rare today. Most pearls used in jewellery are therefore cultured pearls.
Cultured pearls form through the same natural process, but with human involvement at the beginning. A small piece of mantle tissue and, depending on the type of pearl, a nucleus are carefully introduced into an oyster or mussel. The mollusc then forms layers of nacre around it, gradually creating the pearl.
Cultured pearls are genuine pearls and form the foundation of the pearl industry today.
Key Quality Factors
The quality and value of a pearl are determined by several characteristics, with lustre, surface, shape, colour and size among the most important.
Lustre: One of the most important indicators of pearl quality. The finest pearls have a bright, well-defined reflection and a deep lustre that gives the surface a sense of depth.
Surface: Pearls naturally develop with variations in their surface. In general, the fewer visible marks or irregularities, the higher the quality.
Shape: Perfectly round pearls are the rarest and often the most valuable. Pearls also occur in many other forms, including drop, oval and baroque shapes, each with its own character.
Colour: Pearls occur naturally in a wide range of colours, from white and cream to pink, silver, gold and black. Their value is influenced by the particular hue, its intensity and rarity.
Size: Larger pearls are generally rarer and more valuable, provided the other quality factors are also of a high standard.
The Main Types of Pearls
Pearls are broadly divided into freshwater and saltwater pearls. Akoya, South Sea and Tahitian pearls are all saltwater varieties, each with its own characteristics, colours and qualities.
Akoya Pearls
Akoya pearls are known for their high lustre and typically round shape. Cultivated primarily in Japan and China, they have long been associated with classic pearl jewellery and are particularly prized for their bright, reflective surface.
South Sea Pearls
South Sea pearls are among the largest and most valuable cultured pearls in the world and are sometimes referred to as the “queen of pearls”. Cultivated primarily in Australia, Indonesia and the Philippines, they are known for their soft, satin-like lustre and naturally occurring shades of white, silver and gold.
Tahitian Pearls
Tahitian pearls are cultivated in French Polynesia and are known for their naturally dark colours. Their remarkable range of shades includes grey, green, blue and aubergine, often with subtle overtones that shift with the light. These colours occur naturally rather than being created through colour treatment.
Freshwater Pearls
Freshwater pearls are cultivated primarily in China and occur in a wide variety of shapes, sizes and colours. The quality of freshwater pearls has developed considerably over recent decades, and exceptional examples can display beautiful lustre, smooth surfaces and near-round shapes.
Because freshwater pearls are produced in greater quantities, they are generally more accessible and typically have a lower market value than comparable saltwater pearls.
