How much does a 5.00ct+ I SI2 natural emerald diamond cost?

As of November 2026, 5.00ct+ I SI2 natural emerald diamonds typically cost £43,810 GBP to £115,767 GBP, with a median price of £72,194 GBP. There are currently 9 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI2 emerald diamond?

About 26% of these diamonds are available at multiple retailers, with an average price spread of 42%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ I SI2 Natural Emerald

Quick answer

As of November 2026, there are 9 natural emerald diamonds with I colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £43,810 GBP to £115,767 GBP, with a median of £72,194 GBP. At least 19 retailers stock this exact specification, and 26% of the stones appear at more than one of them, with an average price spread of 42%. Half of all listings fall between £6,783 GBP and £10,079 GBP per carat. The same specification in lab grown form lists at a median of about £302 GBP per carat. Over the last 30 days the median price moved +4.1% and the number of listings moved +3.6%.

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: November 2026

Available

Lowest Price

£22,357 GBP

Highest Price

£228,112 GBP

Average Price

£80,792 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

26.2%

Price Spread

42.0%

30-Day Price Trend

+4.1%

30-Day Supply Change

+3.6%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$10,520/ct

10th Percentile

$8,109

Median

$10,520

90th Percentile

$15,650

Score Distribution

29 diamonds scored across 4 quality tiers

Excellent

6 (20.7%)

Very Good

2 (6.9%)

Good

4 (13.8%)

Average

17 (58.6%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

Lab-Grown I SI2Same specifications, lab-grown origin

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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