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Cushion|Natural|GIA

1.71ct J SI1 Cushion Natural Diamond

EX • J/SI1 • GIA 2151050511

Certificate GIA 2151050511

Diamond specifications and retailer prices

From £5,504 GBP
$7,375 USD
As of October 28, 2026
Save £2,161 GBP (28%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £10,187 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 1.71ct natural cushion diamond

This 1.71ct 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 2151050511. Listed at 9 retailers as of October 28, 2026, with a 39% 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

1.71
Carat
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2151050511
Dimensions6.71 × 6.65 × 4.63 mm
L/W Ratio1.01
Culet sizeNone
Top View
6.71 mm6.65 mm1.71 ctJ / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 2151050511
Side View
Table 61.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 69.5%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 28
Current: £10,187 GBP|Low: £5,384 GBP|High: £10,310 GBP|Avg: £7,152 GBP|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 2, 2026
Retailer 4£5,504 GBP
Retailer 5£5,922 GBP
Retailer 6£6,886 GBP
Retailer 3£6,895 GBP
Retailer 2£7,665 GBP
MOH London£10,187 GBP

42 data points across 6 retailers

9 retailers£5,504 GBP to £7,665 GBP

B
Cheapest Retailer
-
£5,504 GBP
$7,375 USD
B
Retailer 2
-
£5,922 GBP
$7,935 USD
View
Final sale: no returns
B
Retailer 3
-
£6,886 GBP
$9,226 USD
View
B
Retailer 4
-
£6,895 GBP
View
B
Retailer 5
-
£7,307 GBP
$9,790 USD
View
B
Retailer 6
-
£7,307 GBP
$9,790 USD
View
B
Retailer 7
-
£7,553 GBP
$10,120 USD
View
B
Retailer 8
-
£7,665 GBP
€9,781 EUR
View
Most Expensive
MOH London
B6593994D · Nov 1
£10,187 GBP
View
Price under review
8 more retailers have this diamond
Prices start from £5,504 GBPSave up to £2,161 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.

B
1.71ct Cushion
£5,504 GBP