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The house · Our standard
The Persian Demantoid Standard.
Six dimensions we use to consider a stone as a whole — and the evidence behind each.
The framework
Six dimensions.
Colour
- What we consider
- Hue, tone, saturation, and how the colour holds in different light.
- How we observe
- Comparison in daylight, warm and cool light.
- What supports it
- Photographs in several lights; written colour family.
Clarity
- What we consider
- Transparency and the nature, visibility and position of inclusions.
- How we observe
- Unaided eye, then 10× magnification.
- What supports it
- Written clarity description; inclusion photographs.
Fire
- What we consider
- Spectral flashes in direct light, alongside brilliance.
- How we observe
- Small point light source; slow movement.
- What supports it
- Video under direct light.
Cut
- What we consider
- Outline, proportions, symmetry and finish of the round brilliant.
- How we observe
- Face-up and profile views.
- What supports it
- Measured dimensions and proportions.
Size
- What we consider
- Documented weight and dimensions, with face-up presence.
- How we observe
- Calibrated scale and gauge.
- What supports it
- Exact weight to two decimals; dimensions in mm.
Rarity
- What we consider
- A contextual view of the combination above — never a claim of value.
- How we observe
- Comparison with documented stones.
- What supports it
- Evidence for any rarity statement.
In practice
How a stone is selected.
First look
Colour and light behaviour are assessed before anything else.
Close inspection
Clarity, cut and finish under magnification.
Record
Weight, dimensions and photographs in several lights.
Disclosure
Treatment and documentation status written into the record.
Clear limits
What the standard is not.
Not a laboratory grade
It does not replace independent gemmological grading or identification.
Not a number
We do not assign numerical scores to undocumented stones.
Not a value promise
Rarity is discussed in context, never as a guarantee of future value.
See the standard applied.
Every store record lists weight, dimensions, colour and clarity.