Fine Emeralds, Sapphires and Rubies: A Buyer's Guide to Coloured Gemstones

Coloured gemstones sit in a different category to diamonds. The grading works differently, and treatments vary more widely too. The gap between a fine stone and a mediocre one also shows on the body far more than it does with diamonds. 

Emerald, sapphire, and ruby are three coloured stones many Singapore buyers ask about, making them worth understanding before you buy.

What Makes a Coloured Gemstone Fine?

Coloured stones are graded on colour, clarity, cut, and carat, much like diamonds, but the priority order changes. Colour leads, and everything else follows from it.

A fine stone shows a rich, saturated hue with strong tone and even distribution throughout. A poor one reads dull, uneven, or washed out under natural light, no matter what the certificate claims.

Clarity matters, though the threshold sits lower than it does for diamonds. Coloured stones are expected to carry inclusions, and what matters is whether they interfere with colour or transparency in the hand.

Gemstone treatments are almost universal across this category of precious stones, and full disclosure separates a reputable seller from a careless one. Fine gemstone jewellery depends on knowing exactly what has been done to each stone before it is set.

Emeralds: Colour Above All

Fine emeralds show a deep, saturated green with slight blue undertones. The finest examples traditionally come from Colombia, though excellent stones are also sourced from Zambia and Brazil.

Inclusions in emeralds are so common they carry their own trade name, jardin, meaning garden. A genuinely clean emerald is rarer than it sounds, and more often points to a lab-grown origin than an exceptional natural stone.

Emeralds are almost always oiled, and minor oiling is the industry standard in fine jewellery. As such, disclosure is essential so consumers know what they are getting. 

Emeralds are also softer than sapphires and rubies, so settings need to protect the stone accordingly. Daily wear rings should be chosen with that difference in mind.

Sapphires and Rubies: Different Colours, Same Family

Sapphire and ruby both belong to the corundum family, the second-hardest gemstone after diamond. Ruby is corundum in red, while sapphire covers every other colour, most commonly blue.

Fine blue sapphires show a rich, velvety blue with strong saturation throughout the stone. Kashmir sapphires have long set the historical benchmark for colour, followed by fine stones from Ceylon, Burma, and Madagascar. Colour remains the deciding factor overall, though origin drives significant premiums at the very top of the market.

Fine rubies show a pure red with a slight fluorescent quality often described in the trade as pigeon blood. Burmese rubies command the highest premiums, followed by stones from Mozambique and Thailand.

Both sapphires and rubies are commonly heat-treated to improve colour and clarity, and this treatment is standard, permanent, and fully accepted in the trade. Unheated stones with fine natural colour carry significant premiums precisely because they are rare.

See a Fine Stone Before You Commit

Sapphire and ruby are the most durable coloured stones, and both sit well in engagement rings, wedding jewellery, and pieces worn every day. Meanwhile, blue sapphires have become a popular engagement alternative to diamond rings in Singapore, particularly over the last decade. 

Emeralds suit pendants, earrings, and pieces worn less than daily far better than rings, since they are the more delicate of the three stones. When emeralds are set in rings, the setting needs to protect the stone with extra care. A fine emerald pairs naturally with a diamond necklace for women, worn on alternating days instead of stacked together. 

Bespoke commissions suit the coloured stone category well, since sourcing a fine stone often takes longer than sourcing a diamond. The piece is then built around the stone, rather than the other way around.

If coloured gemstones have caught your interest alongside diamonds, WhatsApp or email us and we will be glad to continue the conversation at your own pace.