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Cushion|Natural|GIA

1.51ct J SI1 Cushion Natural Diamond

EX • J/SI1 • GIA 6551130924

Certificate GIA 6551130924

Diamond specifications and retailer prices

From £1,677 GBP
As of November 5, 2026
Save £1,376 GBP (45%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,053 GBP at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.51ct natural cushion diamond

This 1.51ct natural cushion sits in the one-and-a-half to two 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 6551130924. Listed at 12 retailers as of November 5, 2026, with prices from £1,677 to £3,053, a £1,376 spread on the same certified stone. Helzberg Diamonds lists it at £3,053. 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

1.51
Carat
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6551130924
Dimensions6.85 × 6.09 × 4.22 mm
L/W Ratio1.12
Top View
6.85 mm6.09 mm1.51 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551130924
Side View
Table 61.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 69.3%

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 5
Current: £3,053 GBP|Low: £1,667 GBP|High: £3,242 GBP|Avg: £2,222 GBP|-5.8%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 6, 2026
Retailer 8£1,677 GBP
Retailer 2£1,745 GBP
Retailer 9£1,774 GBP
Retailer 5£1,872 GBP
Retailer 7£1,898 GBP
Retailer 3£1,931 GBP
Retailer 4£2,022 GBP
Retailer 12£2,090 GBP
Retailer 13£2,186 GBP
Retailer 6£2,503 GBP
Retailer 10£2,705 GBP
Retailer 11£3,021 GBP
Helzberg Diamonds£3,053 GBP

32 data points across 13 retailers

12 retailers£1,677 GBP to £3,053 GBP

A
Cheapest Retailer
-
£1,677 GBP
A
Retailer 2
-
£1,745 GBP
View
A
Retailer 3
-
£1,774 GBP
View
A
Retailer 4
-
£1,898 GBP
View
A
Retailer 5
-
£1,931 GBP
View
A
Retailer 6
-
£2,022 GBP
View
A
Retailer 7
-
£2,090 GBP
View
A
Retailer 8
-
£2,186 GBP
View
A
Retailer 9
-
£2,503 GBP
View
B+
Retailer 10
-
£2,705 GBP
View
B+
Retailer 11
-
£3,021 GBP
View
Most Expensive
B+
Helzberg Diamonds
XZRMLLHHJGPIK · Nov 6
£3,053 GBP
$4,086 USD
View
11 more retailers have this diamond
Prices start from £1,677 GBPSave up to £1,376 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
1.51ct Cushion
£1,677 GBP