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Emerald|Natural|GIA

0.51ct H SI1 Emerald Natural Diamond

ID • H/SI1 • GIA 2557428154

Certificate GIA 2557428154

Diamond specifications and retailer prices

From £290 GBP
$389 USD
As of October 30, 2026
Save £552 GBP (66%) vs most expensive(unlock to see where)
25 retailers carry this diamond
Most expensive: £843 GBP at MOH London · As of October 26, 2026
View at MOH London

About this 0.51ct natural emerald diamond

This 0.51ct natural emerald sits in the half to three-quarter carat band, graded H 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 2557428154. Listed at 25 retailers as of October 26, 2026, with prices from £290 to £843, a £552 spread on the same certified stone. MOH London lists it at £843. 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

0.51
Carat
H
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle47.3°
Pavilion angle56.2°
OriginNatural
Grading LabGIA
CertificateGIA 2557428154
Dimensions5.83 × 3.73 × 2.47 mm
L/W Ratio1.56
Girdle conditionPolished
Top View
5.83 mm3.73 mm0.51 ctH / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 2557428154
Side View
Table 69.0%Crown 47.3°Girdle: MED-STKPavilion 56.2°Culet: NDepth 66.3%

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 30
Current: £843 GBP|Low: £290 GBP|High: £1,396 GBP|Avg: £479 GBP|-4.5%
MOH London
Retailer 2
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Retailer 24
October 31, 2026
Retailer 20£290 GBP
Retailer 9£297 GBP
Retailer 10£299 GBP
Retailer 8£322 GBP
Retailer 6£334 GBP
Retailer 4£346 GBP
Retailer 7£346 GBP
Retailer 18£371 GBP
Retailer 5£375 GBP
Retailer 19£393 GBP
Retailer 11£403 GBP
Retailer 12£403 GBP
Retailer 14£403 GBP
Retailer 16£418 GBP
Retailer 23£437 GBP
Retailer 2£443 GBP
Retailer 17£445 GBP
Retailer 3£446 GBP
Retailer 24£478 GBP
Retailer 15£530 GBP
Retailer 13£535 GBP
Retailer 21£548 GBP
MOH London£843 GBP
Retailer 22£1,361 GBP

21 data points across 24 retailers

25 retailers£290 GBP to £843 GBP

A
Cheapest Retailer
-
£290 GBP
$389 USD
A
Retailer 2
-
£297 GBP
$398 USD
View
Final sale: no returns
A
Retailer 3
-
£299 GBP
$400 USD
View
A
Retailer 4
-
£322 GBP
$431 USD
View
A
Retailer 5
-
£334 GBP
HK$3,500 HKD
View
A
Retailer 6
-
£346 GBP
$464 USD
View
A
Retailer 7
-
£346 GBP
$464 USD
View
A
Retailer 8
-
£371 GBP
$497 USD
View
A
Retailer 9
-
£375 GBP
$502 USD
View
B+
Retailer 10
-
£393 GBP
$527 USD
View
B+
Retailer 11
-
£403 GBP
$540 USD
View
B+
Retailer 12
-
£403 GBP
$540 USD
View
B+
Retailer 13
-
£403 GBP
$540 USD
View
B+
Retailer 14
-
£418 GBP
$560 USD
View
B+
Retailer 15
-
£437 GBP
View
B+
Retailer 16
-
£443 GBP
View
B+
Retailer 17
-
£445 GBP
View
B+
Retailer 18
-
£446 GBP
$598 USD
View
B+
Retailer 19
-
£478 GBP
$640 USD
View
B
Retailer 20
-
£530 GBP
$710 USD
View
B+
Retailer 21
-
£535 GBP
€683 EUR
View
B+
Retailer 22
-
£548 GBP
ZAR 11,865 ZAR
View
Retailer 23
-
£569 GBP
A$1,172 AUD
View
Price last confirmed 27 days ago
Most Expensive
B
MOH London
2072DB740 · Oct 26
£843 GBP
View
23 more retailers have this diamond
Prices start from £290 GBPSave up to £552 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
0.51ct Emerald
£290 GBP