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Carat Hunter · Where to buy diamonds

3ct · K · SI2 · Round · Natural

Every retailer carrying this exact spec, from our latest listings.

Updated November 6, 2026 · Independent. Zero affiliate revenue.

Market at this spec

Active listings

1,850

Retailers carrying

40

Price range

£5,342 to
£38,251

Median confirmed price

£14,754

Certificate mix:GIA 1,291 · IGI 316 · HRD 125

Range and median take each diamond at this spec at its cheapest recently confirmed price. They are cohort statistics, not per-retailer pricing claims.

Every retailer that stocks this spec

Ranked by active inventory count. Selection is mechanical, not editorial.

  1. 1NZ Jewellers203 in stock
    New Zealand·Founded 2006·GIA, HRD, IGI·30-day returns·Ships to United Kingdom
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  2. 2Carbon Sparkle188 in stock
    United States·GIA, HRD, IGI·21-day returns·Ships to United Kingdom
    Terms read on the retailer’s own site, September 2, 2026
    Visit Carbon Sparkle
  3. 3Aurelinne147 in stock
    United States·Founded 2021·GIA, HRD, IGI·Ships to United Kingdom
    Terms not yet verified
    Visit Aurelinne
  4. 4

    The Perfect Carat

    135 in stock
    US·GIA, HRD, IGI
    Terms not yet verified
  6. 6Yorxs108 in stock
    Germany·Founded 2011·GIA, HRD, IGI
    Terms not yet verified
    Visit Yorxs
  7. 7Rare Carat95 in stock
    United States·Founded 2016·GIA, HRD, IGI·30-day returns·Ships to United Kingdom
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  8. 8Allurez86 in stock
    United States·Founded 2010·Ships to United Kingdom
    Terms not yet verified
    Visit Allurez
Show 30 more retailers
  1. 11B2C Jewels69 in stock
    United States·Founded 2004·GIA, HRD, IGI·30-day returns·Ships to United Kingdom
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  2. 12Blue Nile67 in stock
    United States·Founded 1999·GIA, IGI·Ships to United Kingdom
    Terms not yet verified
    Visit Blue Nile
  25. 35

    GemTrove

    3 in stock
    AU·IGI
    Terms not yet verified
  26. 36GemsNY3 in stock
    United States·Founded 1988·GIA·Ships to United Kingdom
    Terms not yet verified
    Visit GemsNY

Stock counts reflect current listings. Founded and shipping details come from public sources. Return terms are our summary of each retailer's own policy page, dated per retailer above. Retailers change their terms, so check the retailer's own returns and shipping pages before you buy.

Explore all 1,850 stones in this cohort

Stones at this spec now

Current examples carried by more than one retailer, so the comparison is real. Prices shown in USD.

See every 3ct natural round diamond, all grades

How pricing is spread at this spec

For the 370 diamonds at this spec with a recently confirmed price, each taken at its cheapest confirmed price, the distribution looks like this:

  • Lowest confirmed
    £5,342
  • 10th percentile
    £9,318
  • Median
    £14,754
  • 75th percentile
    £18,868
  • 90th percentile
    £23,038
  • Highest confirmed
    £38,251

Cohort distribution only. No retailer named adjacent to a dollar figure in this section.

How to pick

Lowest price floor for the spec?

The cheapest confirmed prices start around £9,318. Use the explorer to sort by price.

Sort by price

Best cut quality for the spec?

1,307 of 1,850 active listings carry Excellent or Ideal across cut, polish and symmetry.

View top-cut subset

GIA-graded only?

1,291 of 1,850 (70%) carry GIA. 37 retailers stock GIA at this spec.

Want None or Faint fluorescence?

1,592 of 1,850 are graded None or Faint at this spec.

Shopping from United Kingdom?

24 of the 38 retailers with shipping details ship to United Kingdom. 14 do not. 2 retailers have not published any shipping details.

What this spec means

  • Round: the most common cut, with the highest light return per carat.
  • K colour: Faint tint. Noticeable warmth even face-up, particularly in white-metal settings.
  • SI2 clarity: Slightly Included 2. Inclusions easy to see at 10x. May be visible to the unaided eye in some stones.
  • Natural: mined diamonds with the certification, provenance and resale profile traditional buyers expect.

Compare the top retailers carrying this spec

Side-by-side facts for the two stores carrying the most 3ct K SI2 round natural diamonds.

Compare NZ Jewellers vs Carbon Sparkle

Related specs

Slightly smaller carat

round-2ct-k-si2-natural

One colour grade higher

round-3ct-j-si2-natural

One clarity grade higher

round-3ct-k-si1-natural

Same spec, lab grown

round-3ct-k-si2-lab

Frequently asked

Does Carat Hunter earn commission from these retailers?

No. We earn zero affiliate revenue from any retailer in our index.

How fresh is this data?

Listings refresh as we re-read each retailer, most of them every day. Static facts about each retailer refresh weekly.

Why is one retailer cheaper for the same certificate?

Markup and overhead vary by retailer. The same physical diamond can list at very different prices across stores. See our cross-retailer analysis for the structural reasons.

How is the retailer ranking calculated?

Strictly by active inventory count for this exact spec. The retailer carrying the most stones at the spec ranks first. There is no editorial input, weighting or affiliate consideration.

Why do you not show per-retailer prices on this page?

Prices vary per stone, not per store. Click through to any matched diamond and you will see every retailer's price on the exact same physical stone, which is the meaningful comparison.

Where to Buy 3ct K SI2 Round Natural Diamonds | Carat Hunter