Horse profile

Diamond Necklace (IRE)

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St Mark's Basilica (FR) × Prudenzia (IRE) (Dansili (GB))

TrainerAidan O'Brien
OwnerCoolmore (M Tabor & D Smith & Mrs J Magnier & Westerberg)
FamilyPrudenzia

Sex: filly
Foaled: 2023
Colour: bay

See also: Diamond Necklace (USA) · A P O'Brien · 10 runs · 0 wins

Highest OR: 115
Record (GB & IRE): 3 wins from 3 runs (100%)
Prize money (GB & IRE): £340,260 GB · €77,880 IRE
Official rating: 115 (Flat)
Last run (GB & IRE): 30 Jul 2026, Goodwood (1/5)

Recent form

111

Diamond Necklace: next race and entries

Diamond Necklace holds an entry in the Qatar Racing British Champions Fillies & Mares Stakes at Ascot on Saturday 17 October (14:40).

Qatar Racing British Champions Fillies & Mares Stakes · 17 Oct · 14:40 · Ascot · 9-1 Big race

Queen Elizabeth II Stakes (Sponsored By Qatar Racing) · 17 Oct · 15:20 · Ascot · 9-0 Big race
Qatar Racing Champion Stakes · 17 Oct · 16:00 · Ascot · 9-0 Big race

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Form

Race record

Date	Course	Pos	SP	Btn	Jockey	Trainer	Race	Class	Type	Dist	Going	Wgt	OR	Winner / 2nd	Winner prize	Days	Future form
30 Jul 26	Goodwood	1/5	4/6F	won 2¾	Ryan Moore	Aidan O'Brien	Qatar Nassau Stakes	Group 1	Flat Turf	1m2f	Good to Firm	9-0	113	Friendly Soul (GB)	£340,260	320	0/1
13 Sep 25	Leopardstown (IRE)	1/8	1/2F	won 2¼	Christophe Soumillon	Aidan O'Brien	Ballylinch Stud Irish EBF Ingabelle Stakes (Fillies)	Listed	Flat Turf	7f	Good to Yielding	9-2	-	Sukanya (GB)	€59,000	35	1/6
9 Aug 25	Curragh (IRE)	1/10	9/1	won 1½	Wayne Lordan	Aidan O'Brien	Grand Hotel Malahide Irish EBF Fillies Juvenile Race	Non-handicap (unclassified)	Flat Turf	7f	Good	8-11	-	Minerva (IRE)	€18,880	-	1/8

1/530 Jul 26 · Goodwood4/6F
Qatar Nassau Stakes
Group 11m2fGood to Firm
All fields
Date
30 Jul 26
Course
Goodwood
Pos
1/5
SP
4/6F
Btn
won 2¾
Jockey
Ryan Moore
Trainer
Aidan O'Brien
Race
Qatar Nassau Stakes
Class
Group 1
Type
Flat Turf
Dist
1m2f
Going
Good to Firm
Wgt
9-0
OR
113
Winner / 2nd
Friendly Soul (GB)
Winner prize
£340,260
Days
320
Future form
0/1
1/813 Sep 25 · Leopardstown (IRE)1/2F
Ballylinch Stud Irish EBF Ingabelle Stakes (Fillies)
Listed7fGood to Yielding
All fields
Date
13 Sep 25
Course
Leopardstown (IRE)
Pos
1/8
SP
1/2F
Btn
won 2¼
Jockey
Christophe Soumillon
Trainer
Aidan O'Brien
Race
Ballylinch Stud Irish EBF Ingabelle Stakes (Fillies)
Class
Listed
Type
Flat Turf
Dist
7f
Going
Good to Yielding
Wgt
9-2
OR
-
Winner / 2nd
Sukanya (GB)
Winner prize
€59,000
Days
35
Future form
1/6
1/109 Aug 25 · Curragh (IRE)9/1
Grand Hotel Malahide Irish EBF Fillies Juvenile Race
Non-handicap (unclassified)7fGood
All fields
Date
9 Aug 25
Course
Curragh (IRE)
Pos
1/10
SP
9/1
Btn
won 1½
Jockey
Wayne Lordan
Trainer
Aidan O'Brien
Race
Grand Hotel Malahide Irish EBF Fillies Juvenile Race
Class
Non-handicap (unclassified)
Type
Flat Turf
Dist
7f
Going
Good
Wgt
8-11
OR
-
Winner / 2nd
Minerva (IRE)
Winner prize
€18,880
Days
-
Future form
1/8

Every British and Irish run since 1990, latest first. Btn is the overall distance beaten (lengths). Where the horse won, the runner-up and winning margin are shown.

Future form: next-time-out winners from this horse's races

Date	Course	Race	This horse	Winner next time	Their pos	Won on	At	Race won
13 Sep 25	Leopardstown (IRE)	Ballylinch Stud Irish EBF Ingabelle Stakes (Fillies)	1/8	Killashee Warrior (GB)	4	9 Oct 25	Thurles (IRE)	Irish EBF Auction Series Maiden
9 Aug 25	Curragh (IRE)	Grand Hotel Malahide Irish EBF Fillies Juvenile Race	1/10	Yellowstone Lake (FR)	4	26 Sep 25	Dundalk (AW) (IRE)	Irish Stallion Farms EBF Fillies Maiden

1/813 Sep 25 · Leopardstown (IRE)
Ballylinch Stud Irish EBF Ingabelle Stakes (Fillies)
All fields
Date
13 Sep 25
Course
Leopardstown (IRE)
Race
Ballylinch Stud Irish EBF Ingabelle Stakes (Fillies)
This horse
1/8
Winner next time
Killashee Warrior (GB)
Their pos
4
Won on
9 Oct 25
At
Thurles (IRE)
Race won
Irish EBF Auction Series Maiden
1/109 Aug 25 · Curragh (IRE)
Grand Hotel Malahide Irish EBF Fillies Juvenile Race
All fields
Date
9 Aug 25
Course
Curragh (IRE)
Race
Grand Hotel Malahide Irish EBF Fillies Juvenile Race
This horse
1/10
Winner next time
Yellowstone Lake (FR)
Their pos
4
Won on
26 Sep 25
At
Dundalk (AW) (IRE)
Race won
Irish Stallion Farms EBF Fillies Maiden

Other runners from this horse's races (latest 20 races with a next-time-out winner, up to 40 rows) that won on their next start in Britain or Ireland. FF on the race record = next-time-out winners / runners that have run again (this horse excluded).

Trainer changes

Trainer	First run	Last run	First run for yard	OR first run	OR last run	Best OR	Runs	Wins	2nd	3rd	Win %	Place %	Prize GB (£)	Prize IRE (€)
Aidan O'Brien	9 Aug 25	30 Jul 26	1/10	113	113	113	3	3	0	0	100.0%	100.0%	£340,260	€77,880

Aidan O'Brien

Trainer: Aidan O'Brien
First run: 9 Aug 25
Last run: 30 Jul 26
First run for yard: 1/10
OR first run: 113
OR last run: 113
Best OR: 113
Runs: 3
Wins: 3
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £340,260
Prize IRE (€): €77,880

Trained by one trainer throughout its British and Irish career.

Entries

Upcoming entries and declarations

OR	Status	Date	Time	Course	Race	Class	Dist	Going	Prize	Runners	Wgt
115	Entry	17 Oct 26	14:40	Ascot	Qatar Racing British Champions Fillies & Mares Stakes	Group 1	1m3f211y	Good	£283,550	48	9-1
115	Entry	17 Oct 26	15:20	Ascot	Queen Elizabeth II Stakes (Sponsored By Qatar Racing)	Group 1	1m	Good	£623,810	36	9-0
115	Entry	17 Oct 26	16:00	Ascot	Qatar Racing Champion Stakes	Group 1	1m1f212y	Good	£737,230	45	9-0

Ascot · 2026-10-17

OR: 115
Status: Entry
Date: 17 Oct 26
Time: 14:40
Course: Ascot
Race: Qatar Racing British Champions Fillies & Mares Stakes
Class: Group 1
Dist: 1m3f211y
Going: Good
Prize: £283,550
Runners: 48
Wgt: 9-1

Ascot · 2026-10-17

OR: 115
Status: Entry
Date: 17 Oct 26
Time: 15:20
Course: Ascot
Race: Queen Elizabeth II Stakes (Sponsored By Qatar Racing)
Class: Group 1
Dist: 1m
Going: Good
Prize: £623,810
Runners: 36
Wgt: 9-0

Ascot · 2026-10-17

OR: 115
Status: Entry
Date: 17 Oct 26
Time: 16:00
Course: Ascot
Race: Qatar Racing Champion Stakes
Class: Group 1
Dist: 1m1f212y
Going: Good
Prize: £737,230
Runners: 45
Wgt: 9-0

Declared runners and forward entries, non-runners excluded.

Stats

Career summary by code (GB & IRE)

Code	Runs	Wins	2nd	3rd	Win %	Place %	Prize GB (£)	Prize IRE (€)	Best OR	First run	Last run
Flat	3	3	0	0	100.0%	100.0%	£340,260	€77,880	113	9 Aug 25	30 Jul 26

Flat

Code: Flat
Runs: 3
Wins: 3
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £340,260
Prize IRE (€): €77,880
Best OR: 113
First run: 9 Aug 25
Last run: 30 Jul 26

Placed = 1st in 2-4 runners, 1st-2nd in 5-7, 1st-3rd in 8+.

By race type

Race type	Runs	Wins	2nd	3rd	Win %	Place %	Prize GB (£)	Prize IRE (€)
Flat Turf	3	3	0	0	100.0%	100.0%	£340,260	€77,880

Flat Turf

Race type: Flat Turf
Runs: 3
Wins: 3
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £340,260
Prize IRE (€): €77,880

By going

Going	Runs	Wins	Win %	Place %	Prize GB (£)	Prize IRE (€)
Good to Firm	1	1	100.0%	100.0%	£340,260	€0
Good	1	1	100.0%	100.0%	£0	€18,880
Good to Yielding	1	1	100.0%	100.0%	£0	€59,000

Good to Firm

Going: Good to Firm
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £340,260
Prize IRE (€): €0

Good

Going: Good
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €18,880

Good to Yielding

Going: Good to Yielding
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €59,000

By distance

Distance	Runs	Wins	2nd	3rd	Win %	Place %	Prize GB (£)	Prize IRE (€)
7f to 1m	2	2	0	0	100.0%	100.0%	£0	€77,880
9f to 11f	1	1	0	0	100.0%	100.0%	£340,260	€0

7f to 1m

Distance: 7f to 1m
Runs: 2
Wins: 2
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €77,880

9f to 11f

Distance: 9f to 11f
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £340,260
Prize IRE (€): €0

Flat bands: 5f-6f, 7f-1m, 9f-11f, 12f-13f, 14f+. NH bands: 2m-2m1f, 2m2f-2m5f, 2m6f-3m1f, 3m2f+.

By course

Course	Runs	Wins	Win %	Place %	Prize GB (£)	Prize IRE (€)
Curragh (IRE)	1	1	100.0%	100.0%	£0	€18,880
Goodwood	1	1	100.0%	100.0%	£340,260	€0
Leopardstown (IRE)	1	1	100.0%	100.0%	£0	€59,000

Curragh (IRE)

Course: Curragh (IRE)
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €18,880

Goodwood

Course: Goodwood
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £340,260
Prize IRE (€): €0

Leopardstown (IRE)

Course: Leopardstown (IRE)
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €59,000

By class

Class	Runs	Wins	Win %	Place %	Prize GB (£)	Prize IRE (€)
Group 1	1	1	100.0%	100.0%	£340,260	€0
Listed	1	1	100.0%	100.0%	£0	€59,000
Non-handicap (unclassified)	1	1	100.0%	100.0%	£0	€18,880

Group 1

Class: Group 1
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £340,260
Prize IRE (€): €0

Listed

Class: Listed
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €59,000

Non-handicap (unclassified)

Class: Non-handicap (unclassified)
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €18,880

Pattern (Group/Grade/Listed) shown ahead of class. Irish races carry no class, so they are grouped as handicap or non-handicap.

By field size

Runners	Runs	Wins	Win %	Place %	Prize GB (£)	Prize IRE (€)
2 to 5 runners	1	1	100.0%	100.0%	£340,260	€0
6 to 8 runners	1	1	100.0%	100.0%	£0	€59,000
9 to 12 runners	1	1	100.0%	100.0%	£0	€18,880

2 to 5 runners

Runners: 2 to 5 runners
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £340,260
Prize IRE (€): €0

6 to 8 runners

Runners: 6 to 8 runners
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €59,000

9 to 12 runners

Runners: 9 to 12 runners
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €18,880

By month

Month	Runs	Wins	Win %	Place %	Prize GB (£)	Prize IRE (€)
July	1	1	100.0%	100.0%	£340,260	€0
August	1	1	100.0%	100.0%	£0	€18,880
September	1	1	100.0%	100.0%	£0	€59,000

July

Month: July
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £340,260
Prize IRE (€): €0

August

Month: August
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €18,880

September

Month: September
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €59,000

By jockey

Jockey	Runs	Wins	Win %	Place %	Prize GB (£)	Prize IRE (€)
Christophe Soumillon	1	1	100.0%	100.0%	£0	€59,000
Ryan Moore	1	1	100.0%	100.0%	£340,260	€0
Wayne Lordan	1	1	100.0%	100.0%	£0	€18,880

Christophe Soumillon

Jockey: Christophe Soumillon
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €59,000

Ryan Moore

Jockey: Ryan Moore
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £340,260
Prize IRE (€): €0

Wayne Lordan

Jockey: Wayne Lordan
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €18,880

By trainer

Trainer	Runs	Wins	2nd	3rd	Win %	Place %	Prize GB (£)	Prize IRE (€)
Aidan O'Brien	3	3	0	0	100.0%	100.0%	£340,260	€77,880

Aidan O'Brien

Trainer: Aidan O'Brien
Runs: 3
Wins: 3
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £340,260
Prize IRE (€): €77,880

By headgear

Headgear	Runs	Wins	2nd	3rd	Win %	Place %	Prize GB (£)	Prize IRE (€)
No headgear	3	3	0	0	100.0%	100.0%	£340,260	€77,880

No headgear

Headgear: No headgear
Runs: 3
Wins: 3
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £340,260
Prize IRE (€): €77,880

Headgear codes as declared: b blinkers, v visor, p cheekpieces, t tongue strap, h hood, e/s eyeshield.

By days since last run

Days since last run	Runs	Wins	Win %	Place %	Prize GB (£)	Prize IRE (€)
Debut / no previous run	1	1	100.0%	100.0%	£0	€18,880
31 to 60 days	1	1	100.0%	100.0%	£0	€59,000
121 to 365 days	1	1	100.0%	100.0%	£340,260	€0

Debut / no previous run

Days since last run: Debut / no previous run
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €18,880

31 to 60 days

Days since last run: 31 to 60 days
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £0
Prize IRE (€): €59,000

121 to 365 days

Days since last run: 121 to 365 days
Runs: 1
Wins: 1
2nd: 0
3rd: 0
Win %: 100.0%
Place %: 100.0%
Prize GB (£): £340,260
Prize IRE (€): €0

Counted from the previous run in Britain or Ireland; runs abroad are not seen.

Pedigree

Sire branchSt Mark's Basilica (FR)

Parent · 1

SireSt Mark's Basilica (FR)

Grandparents · 2

Sire's sireSiyouni (FR)
Sire's damCabaret (IRE)

Great-grandparents · 4

Sire's sire's sireNot traced
Sire's sire's damNot traced
Sire's dam's sireNot traced
Sire's dam's damNot traced

Dam branchPrudenzia (IRE)

Parent · 1

DamPrudenzia (IRE)

Grandparents · 2

Dam's sireDansili (GB)
Dam's damNot traced

Great-grandparents · 4

Dam's sire's sireNot traced
Dam's sire's damNot traced
Dam's dam's sireNot traced
Dam's dam's damNot traced

St Mark's Basilica (FR)

Prudenzia (IRE)

Siyouni (FR)

Cabaret (IRE)

Dansili (GB)

Not traced

Breeding card

HorseDiamond Necklace (IRE)

Sexfilly

Foaled2023

SireSt Mark's Basilica (FR)

DamPrudenzia (IRE)

DamsireDansili (GB)

Sire's sireSiyouni (FR)

Sire's damCabaret (IRE)

Dam's produce5 winners from 6 runners

Notable siblingChicquita (IRE)

Female line

Prudenzia (IRE) · 5 winners from 6 runners

Sire, dam and damsire

Sire	Dam	Damsire	Breeder	Foaled	Colour	Sex	Sire's avg winning distance	Damsire's avg winning distance
St Mark's Basilica (FR)	Prudenzia (IRE)	Dansili (GB)	Ecurie Des Monceaux & Skymarc Farm Inc	9 Feb 23	bay	filly	Flat 7.5f	Flat 8.4f · NH 2m2½f

St Mark's Basilica (FR)

Sire: St Mark's Basilica (FR)
Dam: Prudenzia (IRE)
Damsire: Dansili (GB)
Breeder: Ecurie Des Monceaux & Skymarc Farm Inc
Foaled: 9 Feb 23
Colour: bay
Sex: filly
Sire's avg winning distance: Flat 7.5f
Damsire's avg winning distance: Flat 8.4f · NH 2m2½f

Progeny of St Mark's Basilica (FR) in this horse's best conditions

Condition	Runs	Wins	Placed	Win %	Place %	This horse runs	This horse wins
All Flat runs	493	62	151	12.6%	30.6%	3	3
At 7f to 1m	262	39	91	14.9%	34.7%	2	2
On Good going	151	15	39	9.9%	25.8%	2	2
At 7f to 1m on Good going	76	11	23	14.5%	30.3%	2	2

All Flat runs

Condition: All Flat runs
Runs: 493
Wins: 62
Placed: 151
Win %: 12.6%
Place %: 30.6%
This horse runs: 3
This horse wins: 3

At 7f to 1m

Condition: At 7f to 1m
Runs: 262
Wins: 39
Placed: 91
Win %: 14.9%
Place %: 34.7%
This horse runs: 2
This horse wins: 2

On Good going

Condition: On Good going
Runs: 151
Wins: 15
Placed: 39
Win %: 9.9%
Place %: 25.8%
This horse runs: 2
This horse wins: 2

At 7f to 1m on Good going

Condition: At 7f to 1m on Good going
Runs: 76
Wins: 11
Placed: 23
Win %: 14.5%
Place %: 30.3%
This horse runs: 2
This horse wins: 2

Best distance band and going band are where this horse has most wins (then places, then runs) in its main code. Sire figures: all British and Irish runs by the sire's progeny since 1990.

St Mark's Basilica (FR) × Dansili (GB) mares (the cross)

Code	Runners	Winners	Winners %	Black-type winners	Runs	Wins	2nd/3rd	Win %	Prize GB (£)	Prize IRE (€)
Flat	5	2	40.0%	1	23	4	3	17.4%	£343,523	€94,680

Flat

Code: Flat
Runners: 5
Winners: 2
Winners %: 40.0%
Black-type winners: 1
Runs: 23
Wins: 4
2nd/3rd: 3
Win %: 17.4%
Prize GB (£): £343,523
Prize IRE (€): €94,680

All British and Irish runners by this sire out of mares by this damsire, since 1990 (includes this horse). Black type = Group/Grade 1-3 or Listed winner.

Best of the cross

Horse	Runs	Wins	Black-type wins	Best win	Prize GB (£)	Prize IRE (€)
Diamond Necklace (IRE)	3	3	2	Group/Grade 1	£340,260	€77,880
Numantia (IRE)	4	1	0	-	£0	€14,900
Fourth Crusade (IRE)	3	0	0	-	£257	€0
Fleur De Rose (IRE)	5	0	0	-	£0	€1,900
Brave Leader (GB)	8	0	0	-	£3,006	€0

Diamond Necklace (IRE)

Horse: Diamond Necklace (IRE)
Runs: 3
Wins: 3
Black-type wins: 2
Best win: Group/Grade 1
Prize GB (£): £340,260
Prize IRE (€): €77,880

Numantia (IRE)

Horse: Numantia (IRE)
Runs: 4
Wins: 1
Black-type wins: 0
Prize GB (£): £0
Prize IRE (€): €14,900

Fourth Crusade (IRE)

Horse: Fourth Crusade (IRE)
Runs: 3
Wins: 0
Black-type wins: 0
Prize GB (£): £257
Prize IRE (€): €0

Fleur De Rose (IRE)

Horse: Fleur De Rose (IRE)
Runs: 5
Wins: 0
Black-type wins: 0
Prize GB (£): £0
Prize IRE (€): €1,900

Brave Leader (GB)

Horse: Brave Leader (GB)
Runs: 8
Wins: 0
Black-type wins: 0
Prize GB (£): £3,006
Prize IRE (€): €0

Top 12 by best win level, then wins.

Ratings

Official ratings

Code	Current OR	Highest OR	Lowest OR	Last winning OR	Last win	Rated runs
Flat	113	113	113	113	30 Jul 26	1

Flat

Code: Flat
Current OR: 113
Highest OR: 113
Lowest OR: 113
Last winning OR: 113
Last win: 30 Jul 26
Rated runs: 1

Current OR here is the mark carried on the latest run in each code; the page header uses a newer declared mark where one exists.

Official rating by run

Date	Course	Code	OR	Pos
30 Jul 26	Goodwood	Flat	113	1/5

1/530 Jul 26 · Goodwood
All fields
Date
30 Jul 26
Course
Goodwood
Code
Flat
OR
113
Pos
1/5

Current mark v winning marks

Code	Current OR	OR last run	Change	Last winning OR	Last win	v last winning	Highest winning OR	v highest winning	Highest OR	v highest
Flat	115	113	2	113	30 Jul 26	2	113	2	115	0

Flat

Code: Flat
Current OR: 115
OR last run: 113
Change: 2
Last winning OR: 113
Last win: 30 Jul 26
v last winning: 2
Highest winning OR: 113
v highest winning: 2
Highest OR: 115
v highest: 0

Differences are current OR minus the mark shown (positive = higher now). Current OR in the main code uses a newer declared or published mark where one exists.

Family

Dam summary

Prudenzia (IRE)

G1 winners: 2
Produce: 5 winners from 6 runners

Full siblings

No other foal by St Mark's Basilica (FR) out of Prudenzia (IRE) has raced in Britain or Ireland.

Half siblings

By Montjeu (IRE)

Chicquita (IRE)1W · 3R · 1 G1

Female line

1Prudenzia (IRE)

Notable relatives

Half-sister

Chicquita (IRE)1W · 3R · 1 G1
Magic Wand (IRE)3W · 15R · 3 black-type

Niece (out of a sibling)

Emily Dickinson (IRE)4W · 15R · 3 black-type

View full Prudenzia family

In brief

How old is Diamond Necklace?

Diamond Necklace (IRE) is a 3-year-old bay filly, foaled on 9 February 2023.

Who are the sire and dam of Diamond Necklace?

Diamond Necklace (IRE) is by St Mark's Basilica (FR) out of Prudenzia (IRE), a daughter of Dansili (GB), and was bred by Ecurie Des Monceaux & Skymarc Farm Inc.

Who trains Diamond Necklace?

Diamond Necklace (IRE) is trained by Aidan O'Brien and owned by M Tabor & D Smith & Mrs J Magnier & Westerberg, having previously run for Aidan O'Brien in Britain or Ireland.

What is Diamond Necklace's race record?

In Britain and Ireland, Diamond Necklace (IRE) has won 3 of 3 races (100%). Runs abroad (for example in France, Dubai or the USA) are not included.

What is Diamond Necklace's biggest win?

Diamond Necklace (IRE)'s biggest win in Britain or Ireland came in the Qatar Nassau Stakes (Group 1) at Goodwood on 30 July 2026.

Has Diamond Necklace ever been beaten?

Diamond Necklace (IRE) is unbeaten in 3 races in Britain and Ireland.

What is Diamond Necklace's official rating?

Diamond Necklace (IRE) is officially rated 115 on the Flat, a career high.

When did Diamond Necklace last run?

Diamond Necklace (IRE) last ran in Britain or Ireland on 30 July 2026 at Goodwood in the Qatar Nassau Stakes (Group 1), finishing 1st of 5.

When is Diamond Necklace's next race?

Diamond Necklace (IRE) is entered in the Qatar Racing British Champions Fillies & Mares Stakes (Group 1) at Ascot on 17 October 2026 (off 14:40).

Is Diamond Necklace related to any top horses?

Diamond Necklace (IRE)'s black-type relatives in Britain and Ireland include Chicquita (IRE) (half-sister, Group 1 winner), Magic Wand (IRE) (half-sister, Group 2 winner) and Emily Dickinson (IRE) (niece, Group 2 winner), from the Prudenzia (IRE) family.

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Updated 2026-07-30

Diamond Necklace (IRE)

Diamond Necklace: next race and entries

Get an alert the moment Diamond Necklace is declared, plus its RWS score and GPS speed data.

Form

Race record

Future form: next-time-out winners from this horse's races

Trainer changes

Entries

Upcoming entries and declarations

Stats

Career summary by code (GB & IRE)

By race type

By going

By distance

By course

By class

By field size

By month

By jockey

By trainer

By headgear

By days since last run

Pedigree

Pedigree

Parent · 1

Grandparents · 2

Great-grandparents · 4

Parent · 1

Grandparents · 2

Great-grandparents · 4

Breeding card

Female line

Sire, dam and damsire

Progeny of St Mark's Basilica (FR) in this horse's best conditions

St Mark's Basilica (FR) × Dansili (GB) mares (the cross)

Best of the cross

Ratings

Official ratings

Official rating by run

Current mark v winning marks

Family

Dam summary

Full siblings

Half siblings

By Montjeu (IRE)

By Galileo (IRE)

By Muhaarar (GB)

By Night Of Thunder

Female line

Notable relatives

Half-sister

Niece (out of a sibling)

In brief

Get an alert the moment Diamond Necklace is declared, plus its RWS score and GPS speed data.