1.5 Carat Diamond Price · South Africa · Cutter-Direct
How much does a 1.5 carat diamond cost in South Africa?
There is no single price for a 1.5 carat diamond. The weight is only one of four characteristics that set the value, and the per-carat price is higher than at one carat, so the cut, colour and clarity grades move the rand figure more in absolute terms than they do on a smaller stone.
What we can tell you plainly is how the price is built, why a slightly shy 1.40 to 1.45 ct stone is so often the value move at this popular engagement size, and how to get your exact figure, firm, in writing, before any work begins. Natural diamonds only.
See live, fully-landed ZAR prices Get a firm 1.5-carat quote → Email Darren directly →
-
Natural diamonds only
Mined-Earth, never lab-grown, by conviction, not price. Kimberley-Process documented from the mine of origin. Why we don’t sell lab-grown →
-
GIA & EGL certified
Every loose stone certified by the GIA or EGL. Cert PDF supplied per stone.
-
Insured delivery, SA & worldwide
Overnight across South Africa via Brink’s, G4S or our nominated jewellery courier. Insured worldwide dispatch via Ferrari Group and FedEx Custom Critical.
-
14-day in-person exchange
In-person sales at the viewing room come with a 14-day exchange courtesy on stock pieces. Distance-sale CPA cooling-off applies.
Why 1.5 carats is the popular upgrade, and what it costs
The one-and-a-half-carat stone has become the size buyers reach for when a one-carat starts to feel a little small and a full two-carat is out of budget. It reads as a clear, confident size on the hand, yet it sits below the steep two-carat threshold, which is what makes it such a sensible place to spend.
It does cost more than a one-carat, and by more than the weight alone. Rough large enough to yield a clean, well-proportioned 1.5-carat polished stone is scarcer than rough for a one-carat, so the price per carat is higher at this size before you account for the extra half-carat of weight. You then pay that higher per-carat figure across one and a half carats rather than one.
The step is sharpest right at the round weight. A stone at 1.50 ct carries a premium over one at 1.40 ct, because 1.50 is a sought-after threshold, a “magic number”, and the market pays for the figure on the paper. A 1.40 ct and a 1.50 ct diamond look almost identical face-up, so a stone just under the round weight can be quietly cheaper for a difference no one will ever see on your hand.
At 1.5 carats, the 4Cs decide the value
Every diamond is graded on the same four characteristics, and at this size getting them right is where the value is won. Each grade is multiplied by a higher per-carat price than at one carat, so the same one-step difference in colour or clarity costs more in absolute rands here.
- Cut, how well the stone is proportioned and finished, which governs its brightness, fire and face-up size. Protect this first and absolutely: a deep, badly cut 1.5-carat stone hides weight underneath and can look no larger than a well-cut 1.3 ct. We polish round brilliants to GIA Excellent cut grade on our own bench, because cut is the one C a cutting house directly controls.
- Colour, graded D (colourless) down the alphabet as faint warmth appears. The near-colourless G-H band faces up white in a ring, and the rand gap up to a D-F stone is where disciplined buyers save the most at this size.
- Clarity, the presence of tiny natural inclusions, graded from Flawless down. The value zone is “eye-clean”: a VS2-SI1 stone that shows nothing to the naked eye looks identical to a flawless one once set.
- Carat, the weight, and the multiplier the per-carat price applies to. At 1.5 carats it is a larger multiplier than at one, so getting the other three grades right is worth more here.
Spend on cut, buy colour and clarity only to the point where the eye cannot see the difference, and you have the best-value 1.5-carat diamond. Our guides to diamond cut, diamond colour and diamond clarity set out each grade so the spec you set is the right one.
The Rapaport list, dollars, and the path to a rand price
The diamond trade prices polished stones against the Rapaport price list, the international wholesale benchmark, published weekly, that quotes a per-carat dollar figure for each colour-and-clarity combination at every size, including the one-and-a-half-carat band. The price of a given stone is then expressed as a discount or premium to that list according to its exact make, fluorescence and finish.
That dollar figure is converted into rands at the exchange rate on the day, and 15% VAT is added, to reach the fully-landed price you pay. This is why a South African 1.5-carat price can move even when nothing about the stone has changed: a weaker rand lifts the local price of the identical diamond, a stronger rand lowers it.
A retail diamond, by contrast, usually reaches the buyer through an importer, then a wholesaler, then a retail counter, and each link adds its margin. As a cutting house and diamond dealer, we buy rough ourselves, cut and polish it in-house at Procut DCW, and sell the finished stone direct, so the importer and wholesaler markup is not in your price. That is what cutter-direct means: not a sale or a discount, but the removal of the links between the rough and you. Cutting house versus mall jeweller sets out what each side of the counter charges for, and wholesale versus retail pricing explains the structure in full.
What moves the price of a 1.5 carat diamond
These are the factors that set the figure, and the direction each one pushes it. There are no rand values here on purpose: the only honest number is the one quoted for your exact stone.
| Factor | How it moves the price |
|---|---|
| Cut grade | The largest swing for the money. A GIA Excellent cut earns its premium in brightness, fire and face-up size; a deep, dull stone wastes weight and is poor value at any price. |
| Colour grade | Each step toward colourless (D-F) lifts the price; the near-colourless G-H band saves the most in absolute rands at this size. |
| Clarity grade | Higher up the scale (toward Flawless) costs more; an eye-clean VS2-SI1 stone looks identical once set and is the value zone. |
| The 1.50 ct threshold | The per-carat price steps up at the round 1.50 ct “magic number”; a shy 1.40 ct or 1.45 ct looks the same face-up and can be cheaper. |
| Rapaport list movement | The weekly wholesale benchmark shifts the per-carat base for every colour-and-clarity combination in the 1.5-carat band. |
| Rand-dollar exchange rate & VAT | Diamonds trade in US dollars; the ZAR price moves with the exchange rate on the day, then 15% VAT is added to reach the landed figure. |
| Fluorescence & finish | Strong fluorescence and weaker polish or symmetry can discount a stone; a clean finish holds its value. |
| Supply route | Each link removed, importer, wholesaler, retail counter, is margin removed. Cutter-direct is the shortest route from rough to your hand. |
Lab-grown vs natural at 1.5 carats, and what we sell
The price gap between natural and lab-grown is wide at one and a half carats: a 1.5-carat lab-grown diamond is advertised at a small fraction of a natural stone’s price, and that gap is widening as lab-grown supply grows. Lab-grown stones are real diamonds, chemically identical, and a legitimate choice, but they are a different product with a different value trajectory, and we are clear about which one we deal in.
Prodiam works in natural diamonds only. If you are weighing the two at this size, we will help you compare the pros and cons fairly rather than talk you out of it; our natural versus lab-grown comparison lays out the differences honestly so you can decide before you ask us for a figure.
How to get your exact 1.5-carat figure
- 01
See live prices
Open the diamond search to see live, fully-landed ZAR prices and filter to your exact carat, colour, clarity and GIA Excellent cut. Include shy weights, around 1.40 to 1.45 ct, in your filter, the value is often there.
- 02
Tell us the spec
Send your target grades and budget, or just say “a near-colourless, eye-clean 1.5-carat round” and let us interpret it. We respond within 24 hours, by email, video or WhatsApp.
- 03
Firm quote in writing
We quote your chosen stone firm, in ZAR, excl. VAT, referenced to the Rapaport list and after the dollar conversion, a real number for a real stone, not a range. Compare it against any retail quote for the same four grades.
- 04
Verify the certificate
Check the GIA report number yourself against the GIA report-check service. The grades on the paper are the grades you are paying for.
- 05
Buy loose or as a ring
Take the stone as a loose diamond or have it set into a bespoke engagement ring. Delivered insured and overnight nationwide via Brink’s or G4S, with a written insurance valuation.
We are a director-led South African cutting house and diamond dealer, not a shopfront marking up someone else’s stones, and at a popular size like one and a half carats that structure puts more stone on the hand for the same budget.
If you want the honest answer on what your 1.5-carat diamond should cost, the fastest route is to see the live prices and then ask Darren for a firm quote; he will come back within 24 hours. The sizes either side are covered too: our one-carat price guide and our two-carat price guide walk the same ground, and how diamonds are priced in South Africa covers the mechanism across every weight.
1.5 carat diamond price: common questions
How much does a 1.5 carat diamond cost in South Africa?
There is no single figure, because “1.5 carat” is only the weight, one of four characteristics that set the price.
The trade prices every polished stone against the Rapaport list, an international wholesale benchmark quoted weekly in US dollars per carat for each colour-and-clarity combination at each size; the one-and-a-half-carat stone then trades at a discount or premium to that list for its exact make, and the rand-dollar rate of the day converts it before 15% VAT.
Two diamonds that both weigh 1.5 carats can sit far apart in value depending on their cut, colour and clarity. The per-carat figure is higher than at one carat, so the same grade difference costs more in absolute rands. The only honest answer is a number for your exact specification, and you can see live, fully-landed ZAR prices for real 1.5-carat stones on our diamond search.
Is a 1.5 carat diamond noticeably bigger than a 1 carat?
Yes, clearly so, and that is why it is such a popular step up. A well-cut one-carat round brilliant measures roughly 6.5 mm across the top; a one-and-a-half-carat round sits at roughly 7.3 to 7.4 mm.
That is about fifty percent more weight but only around thirteen percent more width, because weight grows with volume rather than diameter, yet the difference reads plainly on the hand and the stone looks like a meaningful upgrade rather than a marginal one.
A 1.5 carat is the size many buyers move to when a one-carat feels slightly small but a two-carat is beyond the budget, and it is one of the most requested weights we cut.
Is a 1.40 or 1.45 carat diamond better value than a full 1.5 carat?
Often, yes. The 1.50 ct mark is a “magic number”, a sought-after round weight that carries a small price premium, and the per-carat figure steps up as a stone reaches it. A 1.40 ct or 1.45 ct round brilliant looks all but identical face-up to a full 1.5 carats, the diameter difference is a fraction of a millimetre, yet it sits below the threshold and can be quietly cheaper.
If the look on the hand matters more to you than the exact figure on the certificate, a slightly shy one-and-a-half-carat stone is one of the strongest value moves we will point you to, and we include those shy weights in any search we run for you.
What 1.5 carat diamond specification gives the best value in South Africa?
The best-value 1.5 carat stone for most South African buyers is a near-colourless, eye-clean round brilliant of GIA Excellent cut grade: a colour in the G-H range, a clarity of VS2 to SI1, and a genuinely excellent cut.
Protect cut absolutely, because it governs the brightness and fire that make the stone look alive and face up to its full diameter, then buy colour and clarity only to the point where the eye cannot see the difference once the stone is set.
An eye-clean SI1 looks identical to a flawless stone in a ring, and an H colour faces up white in most settings, yet the rand gap up to the top of the scale is real. We will tell you honestly where a grade is worth paying for and where it is not visible.
Is a 1.5 carat diamond a good size for an engagement ring?
It is one of the best-balanced choices on the market, which is why it has become a default upgrade. A 1.5 carat centre stone has clear presence on the hand, suits almost every setting from a classic solitaire to a halo, and carries the visual weight people associate with a serious engagement ring, without the steep premium of the two-carat threshold.
Set in a halo it can read close to two carats face-up. For buyers who want the most convincing size their budget will genuinely stretch to, the one-and-a-half-carat round or oval is the size we are asked for most often, and the one where cutter-direct pricing makes the biggest practical difference to what you can afford.
Can I get a 1.5 carat diamond price if I am not in Johannesburg?
Yes, clients buy 1.5 carat diamonds from Cape Town, Durban, Pretoria, Gqeberha and across South Africa without visiting the bench. You can see live, fully-landed ZAR prices on our diamond search and shortlist 1.5-carat stones to your exact grades; the grade conversation and the viewing then happen by video or WhatsApp, and we quote your chosen stone firm in writing.
We send high-resolution video of the actual stone, you verify the certificate before you commit, and the diamond, or the finished ring, is delivered insured and overnight nationwide via Brink’s or G4S with a written insurance valuation. Being outside Johannesburg changes nothing about the price you pay.
Last reviewed: June 2026.