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Carat Hunter · Where to buy diamonds

1ct · G · SI1 · Round · Lab-grown

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

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

Market at this spec

Active listings

333

Retailers carrying

24

Price range

SGD 166 to
SGD 3,813

Median confirmed price

SGD 648

Certificate mix:IGI 268 · GIA 8 · GCAL 1

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.

  3. 3NZ Jewellers29 in stock
    New Zealand·Founded 2006·GIA, IGI·30-day returns·Ships to Singapore
    Terms read on the retailer’s own site, October 19, 2026
    Visit NZ Jewellers
  5. 5

    The Perfect Carat

    22 in stock
    US·IGI
    Terms not yet verified
  7. 7B2C Jewels20 in stock
    United States·Founded 2004·IGI·30-day returns·Ships to Singapore
    Terms read on the retailer’s own site, October 19, 2026
    Visit B2C Jewels
  9. 9Rare Carat19 in stock
    United States·Founded 2016·GIA, IGI·30-day returns·Ships to Singapore
    Terms read on the retailer’s own site, October 19, 2026
    Visit Rare Carat
Show 14 more retailers
  2. 12Yorxs14 in stock
    Germany·Founded 2011·GIA, IGI
    Terms not yet verified
    Visit Yorxs
  7. 17Allurez7 in stock
    United States·Founded 2010·IGI·Ships to Singapore
    Terms not yet verified
    Visit Allurez
  13. 23RockHer1 in stock
    United States·Founded 2016·IGI·Ships to Singapore
    Terms not yet verified
    Visit RockHer

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 333 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 1ct lab grown round diamond, all grades

How pricing is spread at this spec

For the 76 diamonds at this spec with a recently confirmed price, each taken at its cheapest confirmed price, the distribution looks like this:

  • Lowest confirmed
    SGD 166
  • 10th percentile
    SGD 188
  • Median
    SGD 648
  • 75th percentile
    SGD 857
  • 90th percentile
    SGD 1,921
  • Highest confirmed
    SGD 3,813

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 SGD 188. Use the explorer to sort by price.

Sort by price

Best cut quality for the spec?

179 of 333 active listings carry Excellent or Ideal across cut, polish and symmetry.

View top-cut subset

Want None or Faint fluorescence?

317 of 333 are graded None or Faint at this spec.

Shopping from Singapore?

15 of the 22 retailers with shipping details ship to Singapore. 7 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.
  • G colour: near-colourless, one step below the D to F band, with virtually no perceptible colour to most buyers.
  • SI1 clarity: Slightly Included 1. Inclusions noticeable at 10x. Often still eye-clean depending on placement.
  • Lab-grown: chemically identical to natural diamonds, typically at least 90% less than a comparable natural cohort from 1 carat up.

Compare the top retailers carrying this spec

Side-by-side facts for the two stores carrying the most 1ct G SI1 round lab grown diamonds.

Compare Brilliant Earth vs Aurelinne

Related specs

Slightly smaller carat

round-0-75ct-g-si1-lab

Slightly larger carat

round-1-25ct-g-si1-lab

One colour grade higher

round-1ct-f-si1-lab

One colour grade lower

round-1ct-h-si1-lab

One clarity grade higher

round-1ct-g-vs2-lab

One clarity grade lower

round-1ct-g-si2-lab

Same spec, natural

round-1ct-g-si1-natural

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 1ct G SI1 Round Lab Grown Diamonds | Carat Hunter