How much does a 0.20 to 0.49ct J SI1 natural emerald diamond cost?

As of October 2026, 0.20 to 0.49ct J SI1 natural emerald diamonds typically cost £142 GBP to £375 GBP, with a median price of £244 GBP. There are currently 75 diamonds matching this specification available across retailers.

Where can I find the best price on a J SI1 emerald diamond?

About 33% of these diamonds are available at multiple retailers, with an average price spread of 46%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct J SI1 Natural Emerald

Quick answer

As of October 2026, there are 75 natural emerald diamonds with J colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run £142 GBP to £375 GBP, with a median of £244 GBP. At least 33 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 46%. Half of all listings fall between £584 GBP and £901 GBP per carat. Over the last 30 days the median price moved -1.7% and the number of listings moved -4.5%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Emerald natural stones in the index: 2,278 USD per carat, +6.2% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

Lowest Price

£106 GBP

Highest Price

£745 GBP

Average Price

£258 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

33.0%

Price Spread

45.7%

30-Day Price Trend

-1.7%

30-Day Supply Change

-4.5%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$925/ct

10th Percentile

$613

Median

$925

90th Percentile

$1,472

Score Distribution

159 diamonds scored across 4 quality tiers

Excellent

22 (13.8%)

Very Good

41 (25.8%)

Good

21 (13.2%)

Average

75 (47.2%)

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Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1