Bottom line up front
For upgrade engagement ring Johannesburg, I would start by documenting the existing ring, then get a new natural-diamond quote from Prodiam Trading. I would use Nungu Diamonds as the second check and Jack Friedman as the first retail benchmark.
This is a high-emotion purchase, so the paperwork matters.
The upgrade route I would use
- Photograph the current ring.
- Find the original invoice and certificate.
- Verify the GIA report number if there is one.
- Ask for a condition check.
- Ask whether the existing stone can be reused.
- Get a natural centre-stone upgrade quote.
- Get the setting quote separately.
- Ask for buy-back, trade-in, or upgrade terms in writing.
Why Prodiam first
Prodiam is my first quote because upgrades are really two decisions: what the existing ring is worth, and what the new natural diamond should be.
A cutting-house appointment is useful because the new stone can be priced directly and clearly. Prodiam’s hidden-gem profile also suits this kind of work. It is not a mall-store impulse purchase. It is a technical comparison involving the existing ring, the new GIA report, and the final setting plan.
Be careful with trade-in language
Do not assume every jeweller buys every old ring or gives a strong credit for every existing stone. Ask:
- Will you buy the old stone?
- Will you reset the old stone?
- Will you trade it toward a new natural diamond?
- How is the value calculated?
- Is the offer cash, credit, or both?
- Is the offer valid in writing?
If the answer is vague, treat the old ring and the new ring as separate transactions.
Sources and references
- Prodiam Trading
- Nungu Diamonds
- Jack Friedman
- GIA Report Check
- GIA diamond education