Round|Natural|GIA

1.31ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 6551231825

Certificate GIA 6551231825

Diamond specifications and retailer prices

From $3,406 USD
As of October 27, 2026
Save $3,527 USD (51%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $6,933 USD at NZ Jewellers · As of October 27, 2026
View at NZ Jewellers

About this 1.31ct natural round diamond

This 1.31ct natural round sits in the one-and-a-quarter to one-and-a-half carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6551231825. Listed at 16 retailers as of October 27, 2026, with prices from $3,406 to $6,933, a $3,527 spread on the same certified stone. NZ Jewellers lists it at $6,933. 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

1.31
Carat
I
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6551231825
Dimensions6.90 × 6.96 × 4.35 mm
L/W Ratio1.01
Key to symbols
Cloud, Crystal, Feather, Needle
Top View
6.90 mm6.96 mm1.31 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551231825
Side View
Table 58.0%CrownGirdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.7%

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 27
Current: $4,066 USD|Low: $2,586 USD|High: $6,692 USD|Avg: $3,733 USD|+1.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 28, 2026
Retailer 2$2,586 USD
Retailer 3$2,994 USD
Retailer 5$3,205 USD
Retailer 6$3,328 USD
Retailer 13$3,406 USD
Retailer 11$3,459 USD
Retailer 12$3,564 USD
Retailer 4$3,630 USD
Retailer 10$3,959 USD
Retailer 1$4,066 USD
Retailer 7$4,415 USD
Retailer 9$5,807 USD
Retailer 8$6,665 USD

32 data points across 13 retailers

16 retailers$3,406 USD to $6,933 USD

Retailer 1
-
$2,586 USD
HK$20,200 HKD
Price last confirmed 17 days ago
Retailer 2
-
$2,994 USD
€2,852 EUR
View
Price last confirmed 17 days ago
Retailer 3
-
$3,205 USD
View
Price last confirmed 11 days ago
A
Retailer 4
-
$3,406 USD
View
A
Retailer 5
-
$3,459 USD
CA$4,805 CAD
View
Retailer 6
-
$3,533 USD
View
Price last confirmed 17 days ago
A
Retailer 7
-
$3,564 USD
View
Retailer 8
-
$3,630 USD
SGD 4,905 SGD
View
Price last confirmed 17 days ago
Retailer 9
-
$3,669 USD
View
Price last confirmed 16 days ago
B+
Retailer 10
-
$3,959 USD
View
B+
Retailer 11
-
$4,066 USD
£3,202 GBP
View
B+
Retailer 12
-
$4,415 USD
€4,205 EUR
View
B
Retailer 13
-
$5,807 USD
View
Retailer 14
-
$6,155 USD
View
Price last confirmed 17 days ago
B
Retailer 15
-
$6,665 USD
£5,248 GBP
View
Most Expensive
B
NZ Jewellers
c19f5bd4-0333-40ba-8dd5-a043dfc23743 · Oct 27
$6,933 USD
View
15 more retailers have this diamond
Prices start from $3,406 USDSave up to $3,527 USD

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
1.31ct Round
$3,406 USD