How much does a 1.00 to 1.49ct D SI1 natural oval diamond cost?

As of October 2026, 1.00 to 1.49ct D SI1 natural oval diamonds typically cost £1,841 GBP to £5,114 GBP, with a median price of £2,850 GBP. There are currently 782 diamonds matching this specification available across retailers.

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

About 35% 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.

1.00 to 1.49ct D SI1 Natural Oval

Quick answer

As of October 2026, there are 782 natural oval diamonds with D colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,841 GBP to £5,114 GBP, with a median of £2,850 GBP. At least 65 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 46%. Half of all listings fall between £2,159 GBP and £3,349 GBP per carat. The same specification in lab grown form lists at a median of about £340 GBP per carat. Over the last 30 days the median price moved -0.0% and the number of listings moved +1.0%.

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

782

Lowest Price

£784 GBP

Highest Price

£10,183 GBP

Average Price

£3,256 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

35.3%

Price Spread

46.5%

30-Day Price Trend

-0.0%

30-Day Supply Change

+1.0%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$3,413/ct

10th Percentile

$2,503

Median

$3,413

90th Percentile

$5,752

Score Distribution

2.1K diamonds scored across 4 quality tiers

Excellent

332 (15.7%)

Very Good

557 (26.3%)

Good

327 (15.5%)

Average

899 (42.5%)

Find Your Diamond

Search 782 D SI1 oval diamonds and compare prices.

Search Diamonds

Consider Instead

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

D SI2SI2 inclusions are not visible without magnification

Save 15%

Lab-Grown D SI1Same specifications, lab-grown origin

Save 86%

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