CaratHunter
Plans
Radiant|Natural|GIA

1.51ct E SI1 Radiant Natural Diamond

EX • E/SI1 • GIA 2377479568

Certificate GIA 2377479568

Diamond specifications and retailer prices

From $15,850 AUD
$11,134 USD
As of October 30, 2026
Save $5,306 AUD (25%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: $21,156 AUD at 77 Diamonds · As of October 30, 2026
View at 77 Diamonds

About this 1.51ct natural radiant diamond

This 1.51ct natural radiant sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2377479568. Listed at 4 retailers as of October 30, 2026, with prices from $15,850 to $21,156, a $5,306 spread on the same certified stone. 77 Diamonds lists it at $21,156. 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
E
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2377479568
Dimensions7.38 × 5.60 × 3.86 mm
L/W Ratio1.32
Top View
7.38 mm5.60 mm1.51 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2377479568
Side View
Table 65.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 68.9%

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: Oct 30
Current: $21,156 AUD|Low: $15,705 AUD|High: $21,264 AUD|Avg: $18,441 AUD|+1.7%
77 Diamonds
Retailer 2
October 30, 2026
Retailer 2$15,850 AUD
77 Diamonds$21,156 AUD

29 data points across 2 retailers

4 retailers$15,850 AUD to $21,156 AUD

B+
Cheapest Retailer
-
$15,850 AUD
$11,134 USD
B
Retailer 2
-
$16,873 AUD
$11,852 USD
View
B
Retailer 3
-
$17,289 AUD
View
Most Expensive
B
77 Diamonds
RADZVYRPAAA7 · Oct 30
$21,156 AUD
£11,702 GBP
View
3 more retailers have this diamond
Prices start from $15,850 AUDSave up to $5,306 AUD

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+
1.51ct Radiant
$15,850 AUD