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Carat Hunter · Where to buy diamonds

0.5ct · I · SI1 · Marquise · 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

1,380

Retailers carrying

47

Price range

CA$414 to
CA$2,014

Median confirmed price

CA$833

Certificate mix:GIA 1,117 · IGI 212

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. 1Rare Carat132 in stock
    United States·Founded 2016·GIA, IGI·30-day returns·Ships to Canada
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
  3. 3NZ Jewellers82 in stock
    New Zealand·Founded 2006·GIA, IGI·30-day returns·Ships to Canada
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  7. 7

    The Perfect Carat

    61 in stock
    US·GIA, IGI
    Terms not yet verified
  9. 9Yorxs58 in stock
    Germany·Founded 2011·GIA, IGI
    Terms not yet verified
    Visit Yorxs
Show 37 more retailers
  3. 13B2C Jewels44 in stock
    United States·Founded 2004·GIA, IGI·30-day returns·Ships to Canada
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  4. 14RockHer44 in stock
    United States·Founded 2016·GIA, IGI·Ships to Canada
    Terms not yet verified
    Visit RockHer
  7. 17Cape Diamonds31 in stock
    South Africa·Founded 2005·GIA, IGI·7-day returns·Ships to Canada
    Terms read on the retailer’s own site, June 15, 2026
    Visit Cape Diamonds
  11. 21Ritani25 in stock
    United States·Founded 1999·GIA·Ships to Canada
    Terms not yet verified
    Visit Ritani
  17. 27Allurez13 in stock
    United States·Founded 2010·GIA·Ships to Canada
    Terms not yet verified
    Visit Allurez
  21. 31Adiamor7 in stock
    United States·Founded 1999·GIA·Ships to Canada
    Terms not yet verified
    Visit Adiamor
  26. 36ZCOVA7 in stock
    Malaysia·Founded 2015·GIA·Ships to Canada
    Terms not yet verified
    Visit ZCOVA
  32. 42Jared2 in stock
    United States·Founded 1993·GIA
    Terms not yet verified
    Visit Jared
  33. 43Zales2 in stock
    United States·Founded 1924·GIA
    Terms not yet verified
    Visit Zales

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 1,380 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 0.5ct natural marquise diamond, all grades

How pricing is spread at this spec

For the 367 diamonds at this spec with a recently confirmed price, each taken at its cheapest confirmed price, the distribution looks like this:

  • Lowest confirmed
    CA$414
  • 10th percentile
    CA$609
  • Median
    CA$833
  • 75th percentile
    CA$1,000
  • 90th percentile
    CA$1,173
  • Highest confirmed
    CA$2,014

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 CA$609. Use the explorer to sort by price.

Sort by price

Best cut quality for the spec?

66 of 1,380 active listings carry Excellent or Ideal across cut, polish and symmetry.

View top-cut subset

GIA-graded only?

1,117 of 1,380 (81%) carry GIA. 46 retailers stock GIA at this spec.

Want None or Faint fluorescence?

1,230 of 1,380 are graded None or Faint at this spec.

Shopping from Canada?

30 of the 45 retailers with shipping details ship to Canada. 15 do not. 2 retailers have not published any shipping details.

What this spec means

  • Marquise: a pointed-end ellipse that faces up large for its carat.
  • I color: near-colorless, with a faint warm tint just detectable in larger stones.
  • SI1 clarity: Slightly Included 1. Inclusions noticeable at 10x. Often still eye-clean depending on placement.
  • 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 0.5ct I SI1 marquise natural diamonds.

Compare Rare Carat vs 77 Diamonds

Related specs

Slightly larger carat

marquise-0-75ct-i-si1-natural

One colour grade higher

marquise-0-5ct-h-si1-natural

One colour grade lower

marquise-0-5ct-j-si1-natural

One clarity grade higher

marquise-0-5ct-i-vs2-natural

One clarity grade lower

marquise-0-5ct-i-si2-natural

Same spec, lab grown

marquise-0-5ct-i-si1-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 0.5ct I SI1 Marquise Natural Diamonds | Carat Hunter