12 Carat Round Natural Diamond Prices Comparison
As of October 2026, 12 carat round natural diamonds in the 12.00–12.99 carat benchmark range usually range from $106,125 to $1,430,859, with an average price of $478,301.In the last month, prices for these diamonds are up 1.9%.Compare 12 verified listings across 6 retailers tracked by CaratRadar.
12 Carat Round Natural Diamond Market Overview
CaratRadar currently tracks 12 verified 12-carat round natural diamonds in the 12.00–12.99 carat benchmark range, listed across 6 online retailers. Prices in this segment range from $106,125 to $1,430,859, with an average asking price of $478,301 and a median of $419,787.
The price spread of $1,324,734 (92.6% from highest to lowest) highlights why comparing identical certified diamonds across multiple retailers matters. Two identical certified diamonds can differ by hundreds or even thousands of dollars depending on the retailer.
These figures use the same benchmark range throughout the page and are based on our latest daily market data, matched by certification lab and certificate number across retailers, so you are comparing the exact same diamond.
12 diamonds tracked in the 12.00–12.99 carat benchmark
Price range: $106,125 to $1,430,859
Average price: $478,301
Median price: $419,787
Available across 6 retailers
Savings potential: up to 92.6%
Price Range Overview
As of Oct 14, 2026Real market range for this carat, shape, and diamond type.
12
$106,125
$478,301
$419,787
$1,430,859
Price History
Price Comparison Matrix
Live Listings
See all listingsCompare current retailer offers in the same benchmark range and open any listing for full details.
Save 18.2%IGI | 12.06ct | Round | J | VS1 | Excellent
From $203,745
Compare at $249,165
Save 20.5%GIA | 12.12ct | Round | K | SI2 | Excellent
From $219,171
Compare at $275,822
IGI | 12.56ct | Round | K | VVS1 | Excellent
From $248,826
Compare at $269,787
Save 16.6%GIA | 12.02ct | Round | K | VVS1 | Ideal
From $264,505
Compare at $317,292
GIA | 12.06ct | Round | K | VVS1 | Ideal
From $265,308
Compare at $272,805
IGI | 12.07ct | Round | I | VS1 | Excellent
From $299,886
Compare at $299,890
GIA | 12.02ct | Round | I | VVS2 | Excellent
From $404,990
Compare at $437,599
GIA | 12.39ct | Round | E | SI1 | Excellent
From $423,917
Compare at $439,473
GIA | 12.38ct | Round | E | SI1 | Ideal
From $535,358
Compare at $543,781
Save 16.6%GIA | 12.03ct | Round | G | IF | Excellent
From $557,346
Compare at $668,413
Save 16.6%GIA | 12.02ct | Round | G | VVS1 | Excellent
From $584,363
Compare at $700,807
Save 16.6%GIA | 12.98ct | Round | D | VVS2 | Excellent
From $1,193,688
Compare at $1,431,397
Entry pricing in this benchmark range starts around $106,125.
What to Know When Shopping for 12 Carat Round Natural Diamonds
- Always compare identical certified diamonds across retailers. Identical certificate numbers can have price differences of $1,324,734 or more.
- Focus on the 4Cs that matter most to you. Color and clarity grades drive price more than cut in many segments, but cut affects sparkle the most.
- The median price of $419,787 is a useful benchmark. If you see a deal significantly below this, verify the retailer's reputation and return policy.
- Consider eye-clean alternatives. Moving one clarity grade down (e.g., VS2 to SI1) can save 10-15% with no visible difference to the naked eye.
- Compare natural vs. lab-grown options for the same carat and shape. Lab-grown diamonds are chemically identical but often 30-50% less expensive.
- Check shipping, insurance, and return policies. The lowest sticker price is not always the best deal once you factor in total cost of purchase.
- Round brilliants command a premium due to higher rough waste during cutting. If budget matters, consider oval or cushion shapes for similar visual size.
Frequently Asked Questions
We currently track 12 comparable stones in the 12.00–12.99 carat benchmark range. Prices start around $106,125 and go up to $1,430,859.
Based on the latest market data, the average asking price is about $478,301 with a median around $419,787.
The observed spread is roughly $1,324,734 across tracked listings, which is about 92.6% from highest to lowest offer in the 12.00–12.99 carat benchmark range.
We refresh pricing data daily so these pages stay current with market changes.
Based on completed market data, the fair market benchmark is $478,301. The median price is $419,787, so offers between the median and fair benchmark can be reasonable, while reputable listings below the median may be especially competitive.
We currently track this stone category across 6 online retailers, giving you a broad view of the competitive landscape.
For most buyers, color differences below G are hard to detect once set in a ring. Clarity grades of VS2 and above are typically eye-clean. Prioritize cut quality for maximum brilliance, then balance color and clarity based on your budget.
Retailer pricing strategies, overhead costs, and margin targets all contribute. The exact certified diamond can differ by $1,324,734 across sellers, which is why direct certified-diamond comparison is essential.
We match diamonds across retailers by their certification lab and certificate number. This means the prices you see are for the exact same physical diamond, not just stones with similar specs. It is a true apples-to-apples comparison.
Diamond prices fluctuate based on supply and demand. Our data refreshes regularly so you can track trends over time. Use the price range on this page as a benchmark and compare it to historical averages when available.
Diamond Terminology
- Carat
- A unit of weight for diamonds equal to 200 milligrams. Larger carat weights are exponentially rarer, which is why prices increase non-linearly with size.
- Cut
- Refers to how well a diamond's facets interact with light. Cut quality ranges from Ideal to Poor and is the single biggest factor affecting a diamond's brilliance.
- Color
- Grades a diamond's lack of color on a scale from D (colorless) to Z (light yellow). Grades D-F are considered colorless; G-J are near-colorless and offer good value.
- Clarity
- Measures the presence of internal inclusions or surface blemishes. Grades range from Flawless (FL) to Included (I3). Most inclusions in VS2 and above are invisible to the naked eye.
Related Price Categories
Explore adjacent carat ranges and shapes to compare market shifts.
Tracking Natural inventory for the 12.00–12.99 carat Round diamond benchmark.