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· 9 min read

3 Carat Diamond Tennis Bracelet: Size, Cost, Trade-offs

A 3 carat diamond tennis bracelet in CAD: how stone count and wrist size set the look, what the grades change, and where the money actually goes.

A 3 carat diamond tennis bracelet is a continuous line of small round diamonds whose weights add up to about three carats in total. It is not a bracelet holding one three carat stone. On a standard seven inch bracelet that works out to roughly 55 to 60 stones of about 2.4 to 2.5 mm each, which is the size where the line stops reading as a thin thread and starts to look substantial from across a table.

The arithmetic that decides how it looks

Total carat weight tells you almost nothing on its own. What you see on a wrist is stone diameter and how tightly the stones sit together, and those two things are locked to each other by the length of the bracelet.

A carat is a fixed unit. The US Federal Trade Commission's Jewelry Guides state it plainly in a note to 16 CFR §23.18: "A carat is a standard unit of weight for a diamond and is equivalent to 200 milligrams (1/5 gram). A point is one one-hundredth (1/100) of a carat." So a 3.00 ct bracelet contains 600 mg of diamond, however it is divided up.

A seven inch bracelet is about 178 mm long, and after the clasp you have roughly 165 to 170 mm of link run to fill. Each setting occupies its stone's diameter plus about half a millimetre of metal. Run the numbers and the possible combinations narrow fast.

Stone diameterApprox. weight eachStones on a 7" lineApprox. total weight
2.2 mm0.04 ct~62~2.5 ct
2.4 mm0.05 ct~57~2.9 ct
2.5 mm0.057 ct~56~3.2 ct
2.7 mm0.075 ct~52~3.9 ct
3.0 mm0.10 ct~48~4.8 ct

Diameters and weights are approximate and shift with cut proportions, since a deeply cut stone hides weight below the girdle. Treat the table as the shape of the trade-off, not a spec sheet.

Two things follow from it. First, at seven inches a 3.00 ct total is not a free choice, it is what you get from stones of roughly 2.4 to 2.5 mm. If you want 3.0 mm stones, you are buying closer to 4.8 ct. Second, wrist size changes the answer. The same stones on a 6.5 inch bracelet come to about 2.7 ct, and on a 7.5 inch bracelet about 3.2 ct. Comparing a 3 carat bracelet at 6.5 inches with a 3 carat bracelet at 7.5 inches is comparing two different looks.

Setting style changes the count

Bezels wrap metal around each stone and add roughly 0.8 to 1.0 mm per link, so a bezel bracelet at the same length holds fewer, or smaller, stones for the same total. Four prong settings, especially shared prong designs, pack tighter and let more diamond show. Neither is better. Bezels protect girdles and snag less; prongs show more stone and more light return.

What "3 carat" is allowed to mean

This matters more than most people expect, because the number is a total across dozens of stones and small differences compound.

The FTC Guides treat stated weight as a claim you can be held to. Section 23.18 says it is "unfair or deceptive to misrepresent the weight of a diamond," and adds that if weight is stated to one decimal place, "the stated figure should be accurate to the second decimal place (e.g., '.5 carat' could represent a diamond weight between .495–.504)." Section 23.18(d) goes further: where weight is given as a fraction, a seller should disclose conspicuously that the weight is not exact and state a reasonable range or tolerance.

These are US guides, not Canadian law. In Canada, misleading representations fall under the Competition Act and the Competition Bureau. But the Guides are the clearest published statement of North American practice, and reputable Canadian sellers work to them.

The practical reading for you as a buyer:

  • "3.00 ct" is a precise claim. "3 ct" or "3 ctw" is a rounded one, and a bracelet sold that way may sit anywhere in a stated range.
  • Ask for the tolerance in writing. A range like 2.90 to 3.10 ct is normal and honest. A refusal to state one is the warning sign.
  • Compare bracelets at the same length before comparing their totals.

Grades that change the look, and grades that do not

At 2.4 mm, a lot of the grading vocabulary that matters for a centre stone stops mattering.

Clarity is graded under magnification, not by eye. The FTC's own test for the word "flawless" in §23.13 is examination "under a corrected magnifier at 10-power, with adequate illumination, by a person skilled in diamond grading." A VS2 and an SI1 inclusion in a 0.05 ct stone are both invisible face-up to a person looking at your wrist. Paying up through the clarity scale on melee is, in my view, the clearest waste of money in this category.

Colour behaves slightly differently. A single H stone next to a single F stone is hard to call. Fifty of them in a row is easier, because the eye picks up warmth across a mass more readily than in one stone. Even so, the honest position is that most people do not see the difference between a near-colourless line and a colourless one once the bracelet is on. Consistency along the line matters more than the grade itself.

The thing worth being clear-eyed about: individual stones in a tennis bracelet are almost never accompanied by their own grading reports. Melee is bought, sorted and matched in parcels, so what you are buying is a stated range such as F-G colour and VS clarity, backed by the seller, not 57 certificates. That is normal trade practice and not a red flag, but it does mean the grade claim rests on the seller's word rather than a lab's. If independent verification matters to you, that argues for putting your certified-stone budget into a ring centre stone from our loose diamond search and treating the bracelet as a matched-melee purchase.

Metal, and what the Canadian marks tell you

The metal is a real share of the cost and all of the durability. A 7 inch, 3 ct line in 14k gold typically carries somewhere around 8 to 13 grams of metal depending on link design. Platinum is denser again, so both the gram count and the price per gram rise.

Canada regulates what may be stamped on it. Under the Precious Metals Marking Act, a quality mark is "a mark indicating or purporting to indicate the quality, quantity, fineness, weight, thickness, proportion or kind of precious metal in an article," and section 4(3) requires that a dealer applying one also apply a registered trade mark. The Competition Bureau's detailed marking requirements set out the permitted marks: gold from 9K to 24K, with decimal equivalents of .375 (9K), .416 (10K), .583 (14K), .750 (18K) and .916 (22K); platinum at 95 per cent or more, with "no legal tolerances for platinum"; silver at a minimum of .925. The Precious Metals Marking Regulations allow small tolerances on gold, 3 parts per 1,000 without solder and up to 7 with it, and require that the trade mark be applied by the same method as the quality mark.

So a bracelet stamped "14K" with no maker's mark next to it is not marked the way Canadian law contemplates. That is a cheap thing to check on a clasp with a loupe.

What it costs in Canada, and where the money goes

Five components, in roughly the order they consume budget:

  1. The diamonds. Melee is priced per carat, and the per-carat price climbs as stone size climbs even within melee, so 3.00 ct in 60 stones costs less than 3.00 ct in 30 larger ones.
  2. The metal. Grams times the day's metal price, plus loss and refining on the workshop floor.
  3. Setting labour. Fifty-plus stones set individually, each with its own seat cut. This is the line item people underestimate.
  4. The clasp and safety catch. A box clasp with a figure-eight safety costs more to make than a plain box clasp, and is worth it on a piece with this much value in it.
  5. Appraisal and documentation, if you want it for insurance.

Lab-grown stones sit well below natural at the same size and grade, and the gap has kept moving, so any figure you were quoted last year is stale. Note also that much of the world's melee is traded in US dollars. The Bank of Canada published a daily rate of 1.3760 Canadian dollars per US dollar on 21 August 2026, and a two or three per cent move there moves a bracelet quote by real money. For that reason I will not print a fixed CAD price here that will be wrong by Christmas. Price the stones live and price the metal live.

Natural or lab-grown at this total weight

The choice is more consequential on a bracelet than on a ring, because you are multiplying it by 57.

Both are diamond by the regulatory definition. The FTC Guides define a diamond in §23.12 as "a mineral consisting essentially of pure carbon crystallized in the isometric system," with hardness 10, specific gravity approximately 3.52 and refractive index 2.42, with no reference to origin. What the Guides do police is language: §23.12(c)(3) permits "cultured" for laboratory-created diamonds only when qualified by a clear and conspicuous disclosure such as "laboratory-grown" or "laboratory-created," and §23.27 makes it deceptive to use "real," "genuine," "natural" or "precious" for a product "manufactured or produced artificially."

On the natural side, the Kimberley Process defines conflict diamonds as "rough diamonds used by rebel movements or their allies to finance conflict aimed at undermining legitimate governments," and requires that every export be accompanied by a valid KP certificate. Be honest with yourself about what that covers: the scheme certifies rough shipments between participating countries and that definition, not the broader labour and environmental questions people often have in mind.

What to do next

Start with the wrist, not the number. Measure the length first, then decide whether you want the tighter 2.2 mm line or the fuller 2.5 mm one, and let the total carat weight fall out of those two decisions rather than leading with "3 carats." Then set your grade range once and hold it, near-colourless and VS to SI is the sensible band for melee this size.

If you are pricing a bracelet alongside an engagement ring, spend the certified-stone budget on the ring and browse settings and loose diamonds separately so you can see the trade-off directly, then use complete your ring to fix metal, size and engraving before you order. Our other guides cover clasp security and wrist measurement in more detail.

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