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Cushion|Natural|GIA

1.51ct H SI2 Cushion Natural Diamond

EX • H/SI2 • GIA 6551533295

Certificate GIA 6551533295

Diamond specifications and retailer prices

From £2,637 GBP
HK$27,600 HKD
As of November 1, 2026
Save £3,780 GBP (59%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £6,417 GBP at Queensmith · As of October 28, 2026
View at Queensmith

About this 1.51ct natural cushion diamond

This 1.51ct natural cushion sits in the one-and-a-half to two carat band, graded H colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6551533295. Listed at 15 retailers as of October 28, 2026, with prices from £2,637 to £6,417, a £3,780 spread on the same certified stone. Queensmith lists it at £6,417. 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
H
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6551533295
Dimensions7.61 × 5.86 × 4.02 mm
L/W Ratio1.30
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Needle, Indented Natural, Natural
Top View
7.61 mm5.86 mm1.51 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6551533295
Side View
Table 64.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 68.6%

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: £6,417 GBP|Low: £2,618 GBP|High: £6,455 GBP|Avg: £3,803 GBP|+2.3%
Queensmith
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 2, 2026
Retailer 9£2,637 GBP
Retailer 6£2,821 GBP
Retailer 5£3,106 GBP
Retailer 3£3,251 GBP
Retailer 12£3,355 GBP
Retailer 7£3,413 GBP
Retailer 2£3,503 GBP
Retailer 11£3,523 GBP
Retailer 4£3,635 GBP
Retailer 13£3,728 GBP
Retailer 10£3,986 GBP
Retailer 8£5,610 GBP
Queensmith£6,417 GBP

25 data points across 13 retailers

15 retailers£2,637 GBP to £6,417 GBP

A
Cheapest Retailer
-
£2,637 GBP
HK$27,600 HKD
A
Retailer 2
-
£2,821 GBP
₹359,999 INR
View
A
Retailer 3
-
£3,106 GBP
SGD 5,624 SGD
View
B+
Retailer 4
-
£3,229 GBP
$4,327 USD
View
A
Retailer 5
-
£3,251 GBP
$4,356 USD
View
Final sale: no returns
B+
Retailer 6
-
£3,355 GBP
SGD 6,075 SGD
View
A
Retailer 7
-
£3,413 GBP
View
B+
Retailer 8
-
£3,503 GBP
View
B+
Retailer 9
-
£3,523 GBP
$4,720 USD
View
B+
Retailer 10
-
£3,618 GBP
A$7,458 AUD
View
B+
Retailer 11
-
£3,635 GBP
$4,870 USD
View
B+
Retailer 12
-
£3,728 GBP
$4,995 USD
View
B+
Retailer 13
-
£3,986 GBP
€5,087 EUR
View
B
Retailer 14
-
£5,610 GBP
View
Most Expensive
B
Queensmith
6551533295 · Oct 28
£6,417 GBP
View
14 more retailers have this diamond
Prices start from £2,637 GBPSave up to £3,780 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
£2,637 GBP