CaratHunter
Plans
Cushion|Natural|GIA

1.50ct I SI1 Cushion Natural Diamond

EX • I/SI1 • GIA 1517368138

Certificate GIA 1517368138

Diamond specifications and retailer prices

From £4,239 GBP
$5,689 USD
As of November 2, 2026
Save £3,701 GBP (47%) vs most expensive(unlock to see where)
28 retailers carry this diamond
Most expensive: £7,940 GBP at MOH London · As of November 2, 2026
View at MOH London

About this 1.5ct natural cushion diamond

This 1.5ct natural cushion sits in the one-and-a-half to two carat band, graded I 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 1517368138. Listed at 28 retailers as of November 2, 2026, with prices from £4,239 to £7,940, a £3,701 spread on the same certified stone. MOH London lists it at £7,940. 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

1.50
Carat
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.9°
Pavilion angle34.91°
OriginNatural
Grading LabGIA
CertificateGIA 1517368138
Dimensions7.47 × 5.79 × 4.04 mm
L/W Ratio1.29
Key to symbols
Crystal, Needle
Top View
7.47 mm5.79 mm1.50 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1517368138
Side View
Table 65.0%Crown 41.9°Girdle: THK-VTKPavilion 34.91°Culet: NoneDepth 69.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: £7,940 GBP|Low: £4,239 GBP|High: £8,036 GBP|Avg: £5,656 GBP|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 2, 2026
Retailer 10£4,239 GBP
Retailer 8£4,456 GBP
Retailer 9£4,544 GBP
Retailer 6£4,765 GBP
Retailer 4£5,372 GBP
Retailer 2£5,406 GBP
Retailer 7£5,493 GBP
Retailer 3£5,881 GBP
Retailer 5£7,000 GBP
MOH London£7,940 GBP

43 data points across 10 retailers

28 retailers£4,239 GBP to £7,940 GBP

B+
Cheapest Retailer
-
£4,239 GBP
$5,689 USD
B+
Retailer 2
-
£4,413 GBP
$5,922 USD
View
B+
Retailer 3
-
£4,426 GBP
A$9,137 AUD
View
Retailer 4
-
£4,456 GBP
$5,980 USD
View
Price last confirmed 14 days ago
B+
Retailer 5
-
£4,501 GBP
$6,040 USD
View
B+
Retailer 6
-
£4,544 GBP
$6,098 USD
View
Final sale: no returns
B+
Retailer 7
-
£4,563 GBP
$6,124 USD
View
B+
Retailer 8
-
£4,732 GBP
CA$8,820 CAD
View
B+
Retailer 9
-
£4,765 GBP
$6,394 USD
View
B+
Retailer 10
-
£4,780 GBP
$6,415 USD
View
B+
Retailer 11
-
£4,848 GBP
$6,506 USD
View
B
Retailer 12
-
£5,076 GBP
$6,811 USD
View
B
Retailer 13
-
£5,258 GBP
$7,056 USD
View
B
Retailer 14
-
£5,347 GBP
$7,175 USD
View
B
Retailer 15
-
£5,372 GBP
View
B
Retailer 16
-
£5,406 GBP
View
B
Retailer 17
-
£5,446 GBP
$7,308 USD
View
Retailer 18
-
£5,493 GBP
A$11,340 AUD
View
Price last confirmed 11 days ago
B
Retailer 19
-
£5,574 GBP
A$11,508 AUD
View
B
Retailer 20
-
£5,723 GBP
$7,680 USD
View
B
Retailer 21
-
£5,723 GBP
$7,680 USD
View
Retailer 22
-
£5,743 GBP
$7,706 USD
View
Price last confirmed 7 days ago
B
Retailer 23
-
£5,881 GBP
€7,516 EUR
View
B
Retailer 24
-
£5,917 GBP
$7,940 USD
View
B
Retailer 25
-
£6,272 GBP
$8,417 USD
View
Retailer 26
-
£6,277 GBP
$8,424 USD
View
Price last confirmed 10 days ago
B
Retailer 27
-
£7,000 GBP
ZAR 151,755 ZAR
View
Most Expensive
B
MOH London
FF8EED978 · Nov 2
£7,940 GBP
View
27 more retailers have this diamond
Prices start from £4,239 GBPSave up to £3,701 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+
1.50ct Cushion
£4,239 GBP