4Cs.co.za report lens
Fourth C: carat
- Shape
- Stone profile
- Carat
- match
- Colour
- verify
- Clarity
- inspect
- Cut
- route
Match the paper to the stone before price, route, or resale.
Fourth C: carat
Carat is weight, not beauty.
A carat is a unit of weight. Two diamonds with the same carat can look different in size, brilliance, and value because cut, measurements, colour, clarity, lab, and shape all matter.
Certificate first
4Cs together
Specialist route
Inspection lens
VerifyReport, inscription, measurements
InspectLight return, tint, inclusions
CompareCut, colour, clarity, carat together
RouteBuy, sell, insure, or value differently
Short answer
Carat is weight, not beauty.
A carat is a unit of weight. Two diamonds with the same carat can look different in size, brilliance, and value because cut, measurements, colour, clarity, lab, and shape all matter.
Use this rule
Do not judge one C alone. Read the certificate, inspect the actual stone, then decide whether beauty, budget, or resale confidence matters most.
Why magic weights matter
Prices often jump around popular thresholds like 0.50ct, 1.00ct, 1.50ct, and 2.00ct. A 0.90ct diamond can sometimes deliver better visual value than a poorly cut 1.00ct stone.
Spread versus depth
A diamond can hide weight in depth and look smaller face-up. Always compare millimetre measurements, not only carat weight.
Selling a carat-size stone
If you are selling a 0.50ct, 1.00ct, or larger certified natural diamond, Prodiam can review the certificate and physical stone against trade benchmarks.
Decision table
Use the details, not a shortcut.
| Carat range | Typical buyer question | What to check |
|---|---|---|
| 0.30-0.49ct | Does it still look substantial? | Cut, setting, spread |
| 0.50-0.89ct | Best balance for budget? | Certificate and eye-clean clarity |
| 0.90-1.10ct | Is 1ct worth the premium? | Measurements, cut, colour |
| 1.50ct+ | Will it trade well later? | Lab, make, fluorescence, demand |
Direct answers
Common questions
Is a 1 carat diamond always expensive?
No single price applies. Shape, cut, colour, clarity, lab report, fluorescence, and market demand all change value.
Can a smaller diamond look bigger?
Yes. Better spread, shape, and setting can make a lower-carat diamond look larger face-up.
Should I sell a 1 carat diamond privately?
Private sale can work, but certificate verification, security, and payment risk are real. A specialist buyer reduces friction.
When to involve a specialist
If there is a real diamond, the next step is a certificate-led conversation.
Bring the grading report, photos, invoices, valuations, and any estate paperwork. The goal is to move from generic advice to a stone-specific view.
Sources used