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Marquise|Natural|GIA

1.02ct I SI2 Marquise Natural Diamond

VG • I/SI2 • GIA 1558370658

Certificate GIA 1558370658

Diamond specifications and retailer prices

From £1,136 GBP
SGD 2,060 SGD
As of October 31, 2026
Save £935 GBP (45%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £2,071 GBP at Helzberg Diamonds · As of November 1, 2026
View at Helzberg Diamonds

About this 1.02ct natural marquise diamond

This 1.02ct natural marquise sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 1558370658. Listed at 12 retailers as of October 31, 2026, with prices from £1,136 to £2,071, a £935 spread on the same certified stone. Helzberg Diamonds lists it at £2,071. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.02
Carat
I
Colour
SI2
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Crown angle38.56°
Pavilion angle37.51°
OriginNatural
Grading LabGIA
CertificateGIA 1558370658
Dimensions10.27 × 5.47 × 3.14 mm
L/W Ratio1.88
Culet sizeNone
Top View
10.27 mm5.47 mm1.02 ctI / SI2
OriginNatural
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 1558370658
Side View
Table 61.0%Crown 38.56°Girdle: THN-THKPavilion 37.51°Culet: NoneDepth 57.4%

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: £2,071 GBP|Low: £1,136 GBP|High: £2,154 GBP|Avg: £1,464 GBP|-3.9%
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 8£1,136 GBP
Retailer 7£1,155 GBP
Retailer 6£1,155 GBP
Retailer 11£1,257 GBP
Retailer 2£1,283 GBP
Retailer 4£1,383 GBP
Retailer 9£1,393 GBP
Retailer 10£1,540 GBP
Retailer 5£1,627 GBP
Retailer 3£1,905 GBP
Helzberg Diamonds£2,071 GBP

35 data points across 11 retailers

12 retailers£1,136 GBP to £2,071 GBP

A
Cheapest Retailer
-
£1,136 GBP
SGD 2,060 SGD
A
Retailer 2
-
£1,155 GBP
$1,550 USD
View
A
Retailer 3
-
£1,155 GBP
$1,550 USD
View
A
Retailer 4
-
£1,257 GBP
SGD 2,280 SGD
View
A
Retailer 5
-
£1,283 GBP
View
A
Retailer 6
-
£1,383 GBP
$1,856 USD
View
B+
Retailer 7
-
£1,393 GBP
$1,869 USD
View
B+
Retailer 8
-
£1,451 GBP
$1,947 USD
View
B+
Retailer 9
-
£1,540 GBP
$2,067 USD
View
A
Retailer 10
-
£1,627 GBP
€2,080 EUR
View
B+
Retailer 11
-
£1,905 GBP
$2,556 USD
View
Most Expensive
B+
Helzberg Diamonds
XZRHLLOJNGMLO · Nov 1
£2,071 GBP
$2,779 USD
View
11 more retailers have this diamond
Prices start from £1,136 GBPSave up to £935 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
1.02ct Marquise
£1,136 GBP