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

As of October 2026, 0.20 to 0.49ct J SI1 natural oval diamonds typically cost £198 GBP to £492 GBP, with a median price of £329 GBP. There are currently 77 diamonds matching this specification available across retailers.

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

About 25% of these diamonds are available at multiple retailers, with an average price spread of 47%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct J SI1 Natural Oval

Quick answer

As of October 2026, there are 77 natural oval diamonds with J colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run £198 GBP to £492 GBP, with a median of £329 GBP. At least 44 retailers stock this exact specification, and 25% of the stones appear at more than one of them, with an average price spread of 47%. Half of all listings fall between £628 GBP and £1,003 GBP per carat. Over the last 30 days the median price moved -2.9% and the number of listings moved -4.1%.

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. Oval natural stones in the index: 2,655 USD per carat, +10.2% 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

£118 GBP

Highest Price

£978 GBP

Average Price

£335 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

25.5%

Price Spread

46.6%

30-Day Price Trend

-2.9%

30-Day Supply Change

-4.1%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,070/ct

10th Percentile

$700

Median

$1,070

90th Percentile

$1,712

Score Distribution

229 diamonds scored across 4 quality tiers

Excellent

24 (10.5%)

Very Good

59 (25.8%)

Good

50 (21.8%)

Average

96 (41.9%)

Find Your Diamond

Search 77 J SI1 oval diamonds and compare prices.

Search Diamonds

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