Diamond Necklace (IRE)
Diamond Necklace is 6 from 8 on turf including wins in the Qatar Nassau Stakes at Goodwood in Jul 2026, the Prix de Diane Longines at Chantilly in Jun 2026, the Emirates Poule d'Essai Des Pouliches at Longchamp in May 2026 and the Qatar Prix Marcel Boussac at Longchamp in Oct 2025. All four of those wins in our archive came at Group 1 level. She won twice over 6f-7f as a juvenile and twice over 1m2f-1m4f on good to firm. Her last run came when third of 16 in the Qatar Prix de l'Arc de Triomphe at Longchamp in Oct 2026 off a mark of 120.
- 6–8Wins / Runs
- 75%Strike rate
- 8 (100%)Placed
- +10.57£1 level staken=8 at SP
- 1.77Fair A/E n=8 · 1.51 incl. margin
- 120Highest OR
- 60dAvg between runs
A/E compares actual wins with what starting prices implied. "Fair" strips the bookmaker margin from the expectation, so favourites and longshots are judged on the same footing — figures near 1.00 mean the market priced this horse about right.
KTB Speed and Rating
Best recent Speed 94
How fast the horse ran, as points against the day-corrected standard time for its course and distance: 100 is the median GB Class 4 handicap winner on that code; one point is 0.1% of the standard time. A, B or C is how much the day's card could tell us, not how good the run was. What this means →
| Going | Runs | Best | Median | Since 1 Nov 2025 |
|---|---|---|---|---|
| Good to Firm | 1 | — | — | 1 run · — |
| Good to Soft | 1 | — | — | — |
| Good | 1 | — | — | — |
| Distance | Runs | Best | Median | Since 1 Nov 2025 |
|---|---|---|---|---|
| 6f – 7f | 2 | 94A | 85.5 | — |
| 1m2f – 1m4f | 1 | — | — | 1 run · — |
KTB Speed v1 · batch 15 Sep 2026 · GB & Irish racing only · 3 figures from 3 runs · as at 3 Oct 2026 · a record, not a forecast
Both figures are KTB's own, computed from the archive; no vendor rating enters either. Every run's figure is on its form line below with its grade. Grades measure how much the archive could see, never the merit of the run.
Run style from 3 analysed runs since Aug 2025
- Prominent 1 (33%) · 1 win
- Held up 1 (33%) · 1 win
- Mid-division 1 (33%) · 1 win
Pedigree intelligence
Progeny in our archive have won 14.2% of 649 runs since Apr 2025 (145 horses).
Weakest on good going: 9.2% from 152. Strongest over 1m – 1m1f (all codes): 17.8% from 225.
| Going | Runs | Wins | SR | vs sire | This horse |
|---|---|---|---|---|---|
| Firm | 2 | 0 | 0% | −14.2 | — |
| Good to Firm | 102 | 17 | 16.7% | +2.5 | 2 from 2 |
| Good | 152 | 14 | 9.2% | −5 | 1 from 1 |
| Good to Soft | 74 | 18 | 24.3% | +10.1 | 1 from 2 |
| Soft | 109 | 16 | 14.7% | +0.5 | 1 from 1 |
| Heavy | 19 | 3 | 15.8% | +1.6 | 1 from 2 |
| Standard (AW) | 191 | 24 | 12.6% | −1.6 | — |
| Distance (all codes) | Runs | Wins | SR | vs sire | This horse |
|---|---|---|---|---|---|
| Under 6f | 32 | 3 | 9.4% | −4.8 | — |
| 6f – 7f | 275 | 34 | 12.4% | −1.8 | 2 from 2 |
| 1m – 1m1f | 225 | 40 | 17.8% | +3.6 | 2 from 2 |
| 1m2f – 1m4f | 107 | 14 | 13.1% | −1.1 | 2 from 4 |
| 1m5f – 2m | 7 | 1 | 14.3% | +0.1 | — |
| 2m1f – 2m4f | 3 | 0 | 0% | −14.2 | — |
Flat and jumps together (all codes) · since Apr 2025 · as at 31 Oct 2026 · rows under 30 runs muted · win % is the measure, a record not a forecast
10 siblings in the archive, 9 winners — best of them Enemy (GB) (6 wins).
The wins came over 7f–2m; the highest grade won is Group 1 (Chicquita (IRE)).
Family form: Marylebone (FR) won at Yarmouth, 20 Oct 2026.
| Produce | Runs | Wins | Win trips | Best grade |
|---|---|---|---|---|
| Enemy (GB) | 46 | 6 | 7f–2m | Class 2 |
| Magic Wand (IRE) | 17 | 3 | 1m–1m4f | Group 2 |
| Gulliver's Travels (IRE) | 6 | 2 | 1m4f | — |
| Philomene (IRE) | 6 | 2 | 1m–1m2½f | Group 3 |
| Chicquita (IRE) | 7 | 1 | 1m4f | Group 1 |
| Marylebone (FR) | 1 | 1 | 1m | Class 3 |
| Sinnamary (IRE) | 3 | 1 | 1m1f | — |
| Craven's Legend (IRE) | 4 | 1 | 1m2f | — |
| Je Ne Regretterien (GB) | 4 | 1 | 1m4f | — |
| Truth (IRE) | 2 | 0 | — | — |
Record by conditions
| Going | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| Good to Soft | 2 | 1 | 50% | −0.50 |
| Heavy | 2 | 1 | 50% | −0.20 |
| Good to Firm | 2 | 2 | 100% | +1.17 |
| Soft | 1 | 1 | 100% | +1.10 |
| Good | 1 | 1 | 100% | +9.00 |
| Class | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| Class 1 | 3 | 1 | 33% | −1.33 |
| Course | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| Longchamp (FR) | 3 | 2 | 67% | +0.90 |
| Deauville (FR) | 1 | 0 | 0% | −1.00 |
| Goodwood | 1 | 1 | 100% | +0.67 |
| Chantilly (FR) | 1 | 1 | 100% | +0.50 |
| Leopardstown | 1 | 1 | 100% | +0.50 |
| Curragh | 1 | 1 | 100% | +9.00 |
| Distance | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| 1m2f – 1m4f | 4 | 2 | 50% | −0.83 |
| 1m – 1m1f | 2 | 2 | 100% | +1.90 |
| 6f – 7f | 2 | 2 | 100% | +9.50 |
| Jockey | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| Ryan Moore | 4 | 3 | 75% | +0.97 |
| Christophe Soumillon | 2 | 2 | 100% | +1.60 |
| C. Soumillon | 1 | 0 | 0% | −1.00 |
| Wayne Lordan | 1 | 1 | 100% | +9.00 |
| Season | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| 2026 | 5 | 3 | 60% | −0.03 |
| 2025 | 3 | 3 | 100% | +10.60 |
Splits include every sample, however small — muted rows are under 3 runs. A one-from-one record is a fact, not a trend: read the Runs column before the strike rate.
Form
| Date | Course | Race | Pos | Btn | Wgt | OR | Spd | KTB | Jockey | SP |
|---|---|---|---|---|---|---|---|---|---|---|
| 2026 · 5 runs | ||||||||||
| 04 Oct 26+42d | Longchamp (FR) | Qatar Prix de l'Arc de Triomphe (Group 1) | 3/16 | nk | 8-9 | 120 | — | — | C. Soumillon | 10/1 |
| 23 Aug 26+24d | Deauville (FR) | Sumbe Prix Jean Et Louis Romanet | 2/10 | 2 | 8-11 | 120 | — | — | Ryan Moore | 2/9F |
| 30 Jul 26+46d | Goodwood | Qatar Nassau Stakes (Group 1) Settled behind the pace early - third from the 1f mark - travelling well just off the front pair with 2f left - moved through to dispute matters before quickening clear a furlong out - driven out in the closing stages to score well | 1/5 | 9-0 | 115 | 119C | 104B | Ryan Moore | 4/6F | |
| 14 Jun 26+35d | Chantilly (FR) | Prix de Diane Longines (Fillies) (Turf) | 1/11 | 9-0 | 115 | — | — | Ryan Moore | 1/2F | |
| 10 May 26+217d | Longchamp (FR) | Emirates Poule d'Essai Des Pouliches (Fillies) (Turf) | 1/15 | 9-0 | 112 | — | — | Ryan Moore | 4/5F | |
| 2025 · 3 runs | ||||||||||
| 05 Oct 25+22d | Longchamp (FR) | Qatar Prix Marcel Boussac - Criterium des Pouliches (2yo Fillies) (Grande Course) (Turf) | 1/8 | 8-11 | — | — | — | Christophe Soumillon | 11/10F | |
| 13 Sep 25+35d | Leopardstown | Ballylinch Stud Irish EBF Ingabelle Stakes (Fillies' Listed) Sluggish start - settled towards the back - 5th passing halfway - 4th and asked for effort 2f out - swept to front inside final furlong - held on for a clear-cut win | 1/8 | 9-2 | — | 77A | 95A | Christophe Soumillon | 1/2F | |
| 09 Aug 25 | Curragh | Grand Hotel Malahide Irish European Breeders Fund Fillies Juvenile Race Settled in the pack - hampered for a moment 2f out before angling left and driven forward - moved through to hit the front a furlong out - kept going strongly to the line to win | 1/10 | 8-11 | — | 94A | 95A | Wayne Lordan | 9/1 | |
Quick answers
- How many races has Diamond Necklace won?
- Diamond Necklace (IRE) won 6 of 8 archived starts between 2025 and 2026, a strike rate of 75%. Placed 8 times in total (100% of starts).
- Who trains Diamond Necklace?
- Diamond Necklace (IRE) is trained by Aidan O'Brien, who saddled the horse on its most recent run on 4 October 2026.
- Who is Diamond Necklace's sire?
- Diamond Necklace (IRE) is by St Mark's Basilica (FR) out of Prudenzia (IRE), whose sire is Dansili.
- What is Diamond Necklace's official rating?
- The most recent official rating on record is 120, from the run on 4 October 2026. That is also the highest on record.
- What is Diamond Necklace's sire's record?
- St Mark's Basilica (FR)'s progeny in our archive have won 14.2% of 649 runs since Apr 2025 (145 horses), Flat and jumps together. Weakest on good going: 9.2% from 152. Strongest over 1m – 1m1f (all codes): 17.8% from 225.
- Who are Diamond Necklace's siblings?
- Out of Prudenzia (IRE), Diamond Necklace (IRE) has 10 other produce in our archive, 9 of them winners. Most wins: Enemy (GB) (6). Highest grade won: Group 1 (Chicquita (IRE)). The wins came over 7f–2m. As at Nov 2026.