The House
The Founder
Maria Sergejeva is a former Olympic figure skater and four-time Estonian national champion, whose career in elite sport shaped a lifelong commitment to discipline, precision, and excellence.
After competing for Estonia at the highest level, she trained as a gemmologist and founded DiaMaria in Dubai in 2025. The house runs on the same values her sport demanded: discipline and precision.
“Progression in gemology is not only about certificates or instruments; it is about training perception. The longer I work, the more the world reveals its details.”
The House
Every diamond comes with an IGI report, and its report number is laser-inscribed on the girdle. Authenticity travels with the stone.
Nothing is drawn until we have talked. Your idea becomes a sketch, then a 3D render you approve before production begins.
No mass production. Each piece is made once, for one person.
White, yellow or rose, never plated or filled. Made under strict quality control by partner workshops we have selected.
Bespoke
01
We start with the occasion, the person and the stone. Nothing is drawn until we understand what the piece has to carry.
02
We draw by hand, refine the ideas with you, and settle on one direction before anything is modelled.
03
We build the chosen design in 3D so you see the proportions, the setting and each metal option exactly as they will read. You approve before production begins.
04
Our partner workshops produce the piece in solid 18K gold under strict quality control. It arrives in its own case with the IGI report for its stone.
The Four Cs
Every DiaMaria diamond is IGI certified. The grades set in black are the range the house works in as standard.
| Grade | What It Means | At 10× Magnification |
|---|---|---|
| FL / IF | Flawless / Internally flawless | No inclusions visible |
| VVS1 / VVS2 | Very very slightly included | Extremely difficult to spot |
| VS1 / VS2 | Very slightly included | Difficult to spot, never visible to the eye |
| SI1 / SI2 | Slightly included | Visible under a loupe, rarely to the eye |
| Grade | What It Means | Appearance |
|---|---|---|
| D – F | Colourless | No tint, even against a white card |
| G – H | Near colourless | Tint only visible face-down beside a D stone |
| I – J | Near colourless | Faint warmth in larger stones |
| K and below | Faint colour | Visible warmth face-up |
| Grade | What It Means | Light Return |
|---|---|---|
| Excellent | Proportions optimised for brilliance | Maximum fire and scintillation |
| Very Good | Minor deviation from ideal | Near-identical brilliance to the eye |
| Good | Noticeable deviation | Reduced brilliance under mixed light |
| Fair / Poor | Significant deviation | Visible light leakage |
The Journey
2025
Maria Sergejeva founds DiaMaria in Dubai
2025
The Love & Luck bracelet becomes the house signature
2025
The transformable tennis necklace introduces an interchangeable centre stone
2026
Niina Petrokina wears the Olympic necklace on the ice at Milano Cortina
Client Services
See the pieces in person, in Dubai, and talk through a commission from the first sketch.
Book an appointmentTell us the piece or the stone you have in mind. We reply with availability and a quotation.
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