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Marquise|Natural|GIA

0.90ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 6551992390

Certificate GIA 6551992390

Diamond specifications and retailer prices

From £954 GBP
HK$10,000 HKD
As of November 1, 2026
Save £1,273 GBP (57%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £3,100 GBP at NZ Jewellers · As of October 17, 2026
View at NZ Jewellers

About this 0.9ct natural marquise diamond

This 0.9ct natural marquise sits in the just-under-one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6551992390. Listed at 19 retailers as of November 1, 2026, with a 133% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

0.90
Carat
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6551992390
Dimensions9.74 × 5.07 × 3.12 mm
L/W Ratio1.92
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather
Top View
9.74 mm5.07 mm0.90 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6551992390
Side View
Table 61.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 61.6%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £993 GBP|Low: £954 GBP|High: £2,263 GBP|Avg: £1,509 GBP|-2.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 6£954 GBP
Retailer 1£993 GBP
Retailer 10£1,172 GBP
Retailer 9£1,179 GBP
Retailer 2£1,325 GBP
Retailer 11£1,373 GBP
Retailer 4£1,412 GBP
Retailer 3£1,665 GBP
Retailer 8£1,735 GBP
Retailer 7£1,874 GBP
Retailer 5£2,227 GBP

33 data points across 11 retailers

19 retailers£954 GBP to £2,227 GBP

A
Cheapest Retailer
-
£954 GBP
HK$10,000 HKD
A
Retailer 2
-
£993 GBP
₹126,923 INR
View
B+
Retailer 3
-
£1,172 GBP
$1,573 USD
View
Final sale: no returns
B+
Retailer 4
-
£1,179 GBP
SGD 2,138 SGD
View
B+
Retailer 5
-
£1,201 GBP
$1,612 USD
View
B+
Retailer 6
-
£1,203 GBP
$1,615 USD
View
B+
Retailer 7
-
£1,222 GBP
$1,640 USD
View
Retailer 8
-
£1,271 GBP
$1,705 USD
View
Price last confirmed 15 days ago
Retailer 9
-
£1,271 GBP
$1,705 USD
View
Price last confirmed 17 days ago
B
Retailer 10
-
£1,325 GBP
SGD 2,402 SGD
View
Retailer 11
-
£1,329 GBP
$1,784 USD
View
Price last confirmed 16 days ago
B+
Retailer 12
-
£1,373 GBP
$1,842 USD
View
B+
Retailer 13
-
£1,412 GBP
View
Retailer 14
-
£1,467 GBP
$1,968 USD
View
Price last confirmed 14 days ago
Retailer 15
-
£1,665 GBP
A$3,438 AUD
View
Price last confirmed 27 days ago
B
Retailer 16
-
£1,735 GBP
€2,218 EUR
View
B
Retailer 17
-
£1,874 GBP
ZAR 40,636 ZAR
View
B
Retailer 18
-
£2,227 GBP
View
Most Expensive
NZ Jewellers
5e747eff-1b15-4ef9-ac3c-25cc03d9706c · Oct 17
£3,100 GBP
$4,160 USD
View
Price last confirmed 15 days ago
18 more retailers have this diamond
Prices start from £954 GBPSave up to £1,273 GBP

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
0.90ct Marquise
£954 GBP