CaratHunter
Plans
Cushion|Natural|GIA

1.51ct H SI2 Cushion Natural Diamond

EX • H/SI2 • GIA 2554189099

Certificate GIA 2554189099

Diamond specifications and retailer prices

From £1,657 GBP
SGD 3,001 SGD
As of October 31, 2026
Save £1,436 GBP (46%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,094 GBP at Helzberg Diamonds · As of November 1, 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 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 2554189099. Listed at 12 retailers as of October 31, 2026, with prices from £1,657 to £3,094, a £1,436 spread on the same certified stone. Helzberg Diamonds lists it at £3,094. 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
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2554189099
Dimensions6.87 × 6.11 × 4.21 mm
L/W Ratio1.12
Top View
6.87 mm6.11 mm1.51 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2554189099
Side View
Table 62.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 68.9%

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: Oct 31
Current: £3,094 GBP|Low: £1,657 GBP|High: £3,355 GBP|Avg: £2,241 GBP|-7.8%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 2, 2026
Retailer 9£1,657 GBP
Retailer 7£1,770 GBP
Retailer 6£1,800 GBP
Retailer 4£1,937 GBP
Retailer 2£1,945 GBP
Retailer 12£1,960 GBP
Retailer 10£2,119 GBP
Retailer 8£2,135 GBP
Retailer 11£2,213 GBP
Retailer 5£2,539 GBP
Retailer 3£3,080 GBP
Helzberg Diamonds£3,094 GBP

28 data points across 12 retailers

12 retailers£1,657 GBP to £3,094 GBP

A
Cheapest Retailer
-
£1,657 GBP
SGD 3,001 SGD
A
Retailer 2
-
£1,770 GBP
$2,371 USD
View
A
Retailer 3
-
£1,800 GBP
$2,412 USD
View
A
Retailer 4
-
£1,937 GBP
$2,595 USD
View
A
Retailer 5
-
£1,945 GBP
View
A
Retailer 6
-
£1,960 GBP
SGD 3,549 SGD
View
A
Retailer 7
-
£2,119 GBP
$2,839 USD
View
A
Retailer 8
-
£2,135 GBP
$2,860 USD
View
A
Retailer 9
-
£2,213 GBP
$2,965 USD
View
A
Retailer 10
-
£2,539 GBP
$3,402 USD
View
A
Retailer 11
-
£3,080 GBP
$4,127 USD
View
Most Expensive
A
Helzberg Diamonds
XZRILLKHOPGPP · Nov 1
£3,094 GBP
$4,145 USD
View
11 more retailers have this diamond
Prices start from £1,657 GBPSave up to £1,436 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
£1,657 GBP