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Cushion|Natural|GIA

1.51ct D SI1 Cushion Natural Diamond

ID • D/SI1 • GIA 6555094950

Certificate GIA 6555094950

Diamond specifications and retailer prices

From £3,955 GBP
HK$41,400 HKD
As of November 1, 2026
Save £3,855 GBP (49%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £7,810 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6555094950. Listed at 18 retailers as of October 28, 2026, with prices from £3,955 to £7,810, a £3,855 spread on the same certified stone. Queensmith lists it at £7,810. 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
D
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6555094950
Dimensions7.66 × 5.89 × 4.00 mm
L/W Ratio1.30
Top View
7.66 mm5.89 mm1.51 ctD / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6555094950
Side View
Table 68.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 67.9%

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: £7,810 GBP|Low: £3,926 GBP|High: £7,914 GBP|Avg: £5,561 GBP|+1.2%
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 1, 2026
Retailer 9£3,955 GBP
Retailer 2£4,216 GBP
Retailer 3£4,409 GBP
Retailer 5£4,661 GBP
Retailer 11£4,818 GBP
Retailer 7£5,006 GBP
Retailer 12£5,112 GBP
Retailer 4£5,118 GBP
Retailer 13£5,339 GBP
Retailer 10£5,703 GBP
Retailer 8£6,413 GBP
Retailer 6£7,690 GBP
Queensmith£7,810 GBP

27 data points across 13 retailers

18 retailers£3,955 GBP to £7,810 GBP

A
Cheapest Retailer
-
£3,955 GBP
HK$41,400 HKD
A
Retailer 2
-
£4,216 GBP
₹537,956 INR
View
A
Retailer 3
-
£4,409 GBP
$5,908 USD
View
Retailer 4
-
£4,542 GBP
SGD 8,224 SGD
View
Price last confirmed 17 days ago
A
Retailer 5
-
£4,661 GBP
SGD 8,439 SGD
View
A
Retailer 6
-
£4,818 GBP
$6,455 USD
View
Final sale: no returns
B+
Retailer 7
-
£4,846 GBP
$6,493 USD
View
B+
Retailer 8
-
£4,847 GBP
$6,495 USD
View
Retailer 9
-
£4,898 GBP
$6,563 USD
View
Price last confirmed 16 days ago
B+
Retailer 10
-
£5,006 GBP
View
B+
Retailer 11
-
£5,112 GBP
$6,850 USD
View
Retailer 12
-
£5,118 GBP
A$10,551 AUD
View
Price last confirmed 10 days ago
B+
Retailer 13
-
£5,339 GBP
$7,154 USD
View
B+
Retailer 14
-
£5,534 GBP
A$11,408 AUD
View
B+
Retailer 15
-
£5,703 GBP
€7,278 EUR
View
B+
Retailer 16
-
£6,413 GBP
ZAR 138,816 ZAR
View
B
Retailer 17
-
£7,690 GBP
View
Most Expensive
B
Queensmith
6555094950 · Oct 28
£7,810 GBP
View
17 more retailers have this diamond
Prices start from £3,955 GBPSave up to £3,855 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
£3,955 GBP