wheel / two-color grade · dominant Gray
Bluish gray
Group share
3%
Blue-gray group
Exact count
Not disclosed
GIA publishes group shares, not per-grade counts
Median USD per carat
$34.2k
n=1 included + 1 qualified · $34.2k–$34.2k · 15.47–15.47 ct · 1993–1993
Rarity-adjusted value
insufficient data
two-color grades have no published population
auction sales by intensity1 sale
- Fancy Deep—
- Fancy Vivid—
- Fancy Intense—
- Fancy$34.2k/ct · 15.47 ct · 1993
- Fancy Light—
price by intensity
| Intensity | Included n | Median $/ct | Mean $/ct | Low – high | Since 2020 | Qualified | Study stones | Share of cohort |
|---|---|---|---|---|---|---|---|---|
| Fancy Light | — | — | — | — | — | — | — | — |
| Fancy | 1 | $34.2k | $34.2k | — | — | — | — | — |
| Fancy Intense | — | — | — | — | — | — | — | — |
| Fancy Vivid | — | — | — | — | — | — | — | — |
| Fancy Deep | — | — | — | — | — | — | — | — |
methodologyshow
read before interpreting
Group label. Blue-gray versus bluish gray allocation is not disclosed.
related grades
auction sales1 included · 1 qualified
| ID | Intensity | Lot / stone | Carats | Clarity | Sale | Realised | USD / ct | Status | Sources |
|---|---|---|---|---|---|---|---|---|---|
| A703 | Fancy | AN IMPORTANT UNMOUNTED CUT-CORNERED RECTANGULAR-CUT FANCY BLUISH GREY DIAMOND Whole-lot auction result divided by target carats; setting and accents are not deducted. | 15.47 ct | VVS1 | Christie's Geneva · 18 Nov 1993 | CHF 795,500 $529,275 · FRED local units per USD; sale date | $34.2k | Included | lot · fx |
| A291 | Fancy Dark | COLOURED DIAMOND AND DIAMOND RING Whole-lot price divided by target colored carat weight; mounting, accents and signature are included. Natural color origin not explicitly repeated in the accessible catalog; retained as a qualified catalog observation, not a verified natural-color sample. Potential/improvable clarity is mentioned; use the reported present grade, not a promised upgrade. Catalog flags an old report. | 3.60 ct | VVS2 | Christie's Geneva · 16 May 2018 | CHF 540,500 $540,284 · FRED local units per USD; sale date | $150k | Qualified | lot · fx |
supply evidence
this exact grade
| ID | Cohort | Intensity bin | Stones | Share | Period · scope | Limits | Source |
|---|---|---|---|---|---|---|---|
| S094 | Bluish gray | Individual intensity bins | — | — | Reviewed GIA papers, 2002–2025 Evidence gap for exact grade | An all-intensity hue count or pooled-family distribution does not disclose this exact hue’s distribution. Blank numeric cells mean unavailable, not zero. | See GIA Evidence hue cohorts |
evidence
R18
G3
Blue-gray group3% of >15,000Exact count not stated
>15,000 blue/gray/violet study submissions · Pre-2018 study; last decade
Group label. Blue-gray versus bluish gray allocation is not disclosed.