wheel / two-color grade · dominant Blue
Gray-blue
Group share
14%
Gray-blue group
Exact count
Not disclosed
GIA publishes group shares, not per-grade counts
Median USD per carat
$101k
n=8 included + 1 qualified · $33.2k–$220k · 0.86–6.96 ct · 1992–2021
Rarity-adjusted value
insufficient data
two-color grades have no published population
auction sales by intensity9 sales
price by intensity
| Intensity | Included n | Median $/ct | Mean $/ct | Low – high | Since 2020 | Qualified | Study stones | Share of cohort |
|---|---|---|---|---|---|---|---|---|
| Fancy Light | — | — | — | — | — | — | — | — |
| Fancy | 8 | $101k | $123k | $33.2k – $220k | $204k · n=2 | $132k · n=1 | — | — |
| Fancy Intense | — | — | — | — | — | — | — | — |
| Fancy Vivid | — | — | — | — | — | — | — | — |
| Fancy Deep | — | — | — | — | — | — | — | — |
methodologyshow
read before interpreting
Group label. Gray-blue versus grayish blue allocation is not disclosed.
related grades
auction sales8 included · 1 qualified
| ID | Intensity | Lot / stone | Carats | Clarity | Sale | Realised | USD / ct | Status | Sources |
|---|---|---|---|---|---|---|---|---|---|
| A263 | Fancy | IMPORTANT FANCY GRAY-BLUE AND NEAR COLORLESS DIAMOND RING Whole-lot price divided by target colored carat weight; mounting, accents and signature are included. | 4.00 ct | Not stated | Christie's New York (online) · 21 Oct 1992 | USD 308,000 $308,000 · USD as reported | $77.0k | Included | lot |
| A265 | Fancy | IMPORTANT FANCY GRAY-BLUE DIAMOND RING Whole-lot price divided by target colored carat weight; mounting, accents and signature are included. | 5.26 ct | VS1 | Christie's New York (online) · 19 Oct 1994 | USD 387,500 $387,500 · USD as reported | $73.7k | Included | lot |
| A300 | Fancy | A RARE COLORED DIAMOND RING Whole-lot price divided by target colored carat weight; mounting, accents and signature are included. | 4.10 ct | SI2 | Christie's New York · 8 Jun 2021 | USD 846,000 $846,000 · USD as reported | $206k | Included | lot |
| A552 | Fancy | 1.36 ct Gray-blue diamond auction lot Published whole-lot result divided by target carats; setting and accents not deducted. | 1.36 ct | SI1 | Heritage United States / online · 7 Dec 2020 | USD 275,000 $275,000 · USD as reported | $202k | Included | lot |
| A699 | Fancy | A FANCY GRAY-BLUE AND NEAR COLORLESS DIAMOND RING Whole-lot auction result divided by target carats; setting and accents are not deducted. | 2.48 ct | VVS1 | Christie's New York · 11 Apr 2000 | USD 82,250 $82,250 · USD as reported | $33.2k | Included | lot |
| A715 | Fancy | AN UNMOUNTED CIRCULAR-CUT COLORED DIAMOND Loose round diamond, GIA Type IIb letter. | 3.09 ct | VS2 | Christie's New York · 11 Dec 2007 | USD 679,400 $679,400 · USD as reported | $220k | Included | lot |
| A716 | Fancy | A COLORED DIAMOND RING Whole-lot auction result divided by target carats; setting and accents are not deducted. | 6.96 ct | VS1 | Christie's New York · 21 Oct 2009 | USD 866,500 $866,500 · USD as reported | $124k | Included | lot |
| A728 | Fancy | COLORED DIAMOND RING Whole-lot auction result divided by target carats; setting and accents are not deducted. | 0.86 ct | Not stated | Christie's New York · 5 Dec 2018 | USD 37,500 $37,500 · USD as reported | $43.6k | Included | lot |
| A299 | Fancy | IMPORTANT COLOURED 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. | 3.18 ct | VS2 | Christie's Hong Kong · 23 May 2021 | HKD 3,250,000 $418,599 · FRED local units per USD; prior business day | $132k | Qualified | lot · fx |
supply evidence
this exact grade
| ID | Cohort | Intensity bin | Stones | Share | Period · scope | Limits | Source |
|---|---|---|---|---|---|---|---|
| S092 | Gray-blue | 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
R17
G3
Gray-blue group14% of >15,000Exact count not stated
>15,000 blue/gray/violet study submissions · Pre-2018 study; last decade
Group label. Gray-blue versus grayish blue allocation is not disclosed.