Gemstones

Gemstones

Diamonds and gemstones are chosen for more than just their beauty—character, quality, and traceability matter. Stones are sourced through trusted suppliers in Antwerp and beyond, with a focus on transparency and long-term value.


Knowing where your gemstones come from is part of understanding what makes them meaningful.

Precious Gemstones

Most gemstones are complex minerals formed under extreme conditions, with unique chemical compositions and colours. This category includes the classics—rubies, sapphires, emeralds—as well as a wide range of semi-precious stones, each with its own visual and structural properties.

Diamonds stand apart. Composed entirely of carbon, they form in a tightly bonded crystal lattice, resulting in exceptional hardness and unmatched brilliance.


In choosing stones, both beauty and sourcing are considered. Whenever possible, transparency around origin and ethics is prioritised.

From soft sapphires to vivid rubies, each stone is unique.

Grading Gemstones

Gemstones are typically graded on the same four factors as diamonds: colour, clarity, cut, and carat. However, for coloured stones, colour is by far the most important determinant of value.


Colour

Three factors shape how a gemstone’s colour is assessed:

  • Hue – The stone’s main colour and any secondary tones

  • Tone – The lightness or darkness of that colour

  • Saturation – The intensity or vividness


The most desirable stones strike a balance: pure, vibrant colour with good saturation—not too pale, not overly dark.

In coloured gemstones, many cutters prioritise maximising colour over achieving symmetry. Native cuts are often used to bring out a stone’s best tone, even if the proportions vary.

Clarity

Clarity describes internal inclusions and external blemishes. In coloured stones, clarity grading is more flexible than in diamonds and depends on the type of gem.

Inclusions are often accepted—sometimes even valued—as part of a stone’s natural character. For others, transparency is key to quality.

Cut

The goal of a coloured gemstone cut is not perfection but enhancement. It’s about making the colour as rich and visible as possible.

Faceting style, polish, and proportion all matter—but the primary role of the cut is to reveal the best version of the stone’s colour.

Carat

Carat refers to weight: 1 carat = 0.2 grams. But unlike diamonds, coloured gemstones aren’t always priced by weight alone.

Shape, depth, and face-up size can all influence how a stone presents. A well-cut stone may appear larger or more vibrant than another of the same weight.

Portrait of Trine Lamm, founder of By Lamm, inviting clients to book a free consultation about diamonds, investments, or bespoke jewellery pieces

Speak directly with trine lamm

Speak with Trine Lamm to explore diamonds, investments, or bespoke pieces — with clarity and personal care in focus.

Portrait of Trine Lamm, founder of By Lamm, inviting clients to book a free consultation about diamonds, investments, or bespoke jewellery pieces

Speak directly with trine lamm

Speak with Trine Lamm to explore diamonds, investments, or bespoke pieces — with clarity and personal care in focus.

Portrait of Trine Lamm, founder of By Lamm, inviting clients to book a free consultation about diamonds, investments, or bespoke jewellery pieces

Speak directly with trine lamm

Speak with Trine Lamm to explore diamonds, investments, or bespoke pieces — with clarity and personal care in focus.

Portrait of Trine Lamm, founder of By Lamm, inviting clients to book a free consultation about diamonds, investments, or bespoke jewellery pieces

Speak directly with trine lamm

Speak with Trine Lamm to explore diamonds, investments, or bespoke pieces — with clarity and personal care in focus.

Guide before buying diamonds

Before buying a diamond, it helps to know the basics. We’ll guide you through cut, clarity, colour, and carat—so you can make a choice that feels right. Simple, clear, and helpful.

Guide before buying diamonds

Before buying a diamond, it helps to know the basics. We’ll guide you through cut, clarity, colour, and carat—so you can make a choice that feels right. Simple, clear, and helpful.

Guide before buying diamonds

Before buying a diamond, it helps to know the basics. We’ll guide you through cut, clarity, colour, and carat—so you can make a choice that feels right. Simple, clear, and helpful.

Guide before buying diamonds

Before buying a diamond, it helps to know the basics. We’ll guide you through cut, clarity, colour, and carat—so you can make a choice that feels right. Simple, clear, and helpful.

Black and white photo of hands wearing diamond rings and bracelets, reflecting By Lamm’s modern, timeless jewellery styling

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Black and white photo of hands wearing diamond rings and bracelets, reflecting By Lamm’s modern, timeless jewellery styling

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Black and white photo of hands wearing diamond rings and bracelets, reflecting By Lamm’s modern, timeless jewellery styling

Sign up for insider access to curated edits, newsletter, and more

Black and white photo of hands wearing diamond rings and bracelets, reflecting By Lamm’s modern, timeless jewellery styling

Sign up for insider access to curated edits, newsletter, and more