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CASTA DIVA
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Editorial portrait with fancy yellow diamond jewellery

A little extraordinary.
Entirely yours.

Lab-grown diamonds and coloured gemstones,
personally selected for your next chapter.

Find your diamondMeet Casta Diva
Explore fancy colour

Chosen for you

A selection guided by your taste and your priorities.

Details before decisions

The actual stone, report and complete quote, agreed before you order.

A personal conversation

Real people, here to help you find what feels right.

Find your kind of brilliance.

Nine silhouettes. One considered choice. Begin with the shape that speaks to you.

Explore diamonds
RoundOvalPrincessCushionEmeraldPearMarquiseAsscherHeart

EU guide budgets include delivery, import / clearance and VAT allowances. Final costs depend on your destination and the actual stone.

How our guide budgets work

See the size.
Find your proportion.

Explore nine shapes, from 0.30 to 5.00 carats. Compare their face-up proportions on a reference hand.

1.00 carat round diamond proportion on the ring finger of a reference hand
Reference hand · US ring size 6
Carat weight
1.00 ct
Approx. diameter
6.40 mm
Diamond shape
Skin tone

Illustrative proportions, not a true-to-life screen scale. Actual measurements and appearance vary; your final selection is assessed using its laboratory report and imagery. Fancy shapes scale from typical one-carat dimensions.

Explore this shape

A world beyond white.

From soft yellow to vivid colour, choose a stone with its own character.

Explore fancy colour

EU guide budgets include delivery, import / clearance and VAT allowances. Final costs depend on your destination and the actual stone.

How our guide budgets work

Colour, with character.

A personal palette of lab-grown emerald, ruby and Paraiba-colour gemstones.

Explore gemstones

EU guide budgets include delivery, import / clearance and VAT allowances. Final costs depend on your destination and the actual stone.

How our guide budgets work
Editorial still-life of a loose diamond on silver-blue silk

The stone is only
the beginning.

Your taste, your proportions, your priorities. We help turn them into a considered choice, with the details agreed before you order.

Our approach

For the hands
that create.

A sourcing partner for independent jewellers and ateliers. Single stones, matched pairs and melee, selected to your brief.

Work with Casta Diva

A little clarity.

Source-backed explanations and practical buying checklists.

Read the journal
Choosing your stone · 4 min read

Oval or round? Choose the proportions before the carat number.

Two familiar silhouettes create very different impressions. Compare width, length, movement and the ring around them, rather than assuming equal weight means equal presence.

Read the guideChoosing your stone · 4 min read

Cut, polish and symmetry: three different questions about light.

An impressive grade line is a starting point, not a complete description of beauty. Learn what to compare before choosing a lab-grown diamond for a ring.

Read the guideThe essentials · 4 min read

Are lab-grown diamonds real? A clear comparison with natural diamonds.

Same gemstone material. Different origin. What that means for appearance, everyday wear and a considered purchase.

Read the guide