How we price
The formula
Selling price = metal value + labour + stone value
| Component | How it is calculated | Source |
|---|---|---|
| Metal value | Fine-gold weight times the 9999 selling price on the board in force | KBMC board, published on Gold prices |
| Labour | Listed per design: design, making, setting, finishing | Price tag, product page |
| Stone value | Listed per stone, matched to its grading report | Grading report, price tag |
The total is rounded up to the nearest 1,000 VND and includes value added tax.
Fine-gold weight
Fine-gold weight is the pure gold contained in the piece:
Fine-gold weight = metal weight times purity
| Hallmark | Purity used |
|---|---|
| 999.9 (24K) | 0.9999 |
| 750 (18K) | 0.750 |
| 585 (14K) | 0.585 |
| 416 (10K) | 0.416 |
Units: 1 chỉ = 3.75 g; 1 tael (lượng) = 10 chỉ = 37.5 g. The website and invoices show weight in chỉ with grams alongside.
Worked example
An 18K gold ring, 3.20 g of metal, one diamond listed at 20,000,000 VND, labour 2,500,000 VND. Assume the 9999 selling price is 14,380,000 VND per chỉ.
- Fine-gold weight: 3.20 × 0.750 = 2.400 g = 0.640 chỉ.
- Metal value: 0.640 × 14,380,000 = 9,203,200 VND.
- Add labour and stone: 9,203,200 + 2,500,000 + 20,000,000 = 31,703,200 VND.
- Rounded up: 31,704,000 VND.
These figures illustrate the method only and are not a quote.
How the board is issued
- KBMC references world prices, exchange rates and domestic market prices, published side by side on the Gold prices page for comparison.
- The KBMC board is drafted by one person and approved by another, timestamped to the second, and applies to the boutique and website at once.
- Every transaction stores the board it used, so any past price can be traced back exactly.
What KBMC does not do
- Merge the three components into one number.
- Sell metal below the board to attract buyers and recover it through labour.
- Charge hidden fees: engraving, resizing or delivery charges, if any, are stated before payment.