From “PT950 diamond 0.05ct, price 4,700” alone, you cannot fairly conclude whether the ring is expensive. The missing facts are important: currency, purchase year, net platinum weight, exact style, brand channel, certificate, after-sale policy and whether 4,700 means new retail price or another quote.
What the two marks do tell you
- PT950 usually indicates a platinum alloy with platinum fineness around 950‰. The GB 11887-2012 national standard record was listed as the current mandatory Chinese standard when checked on 11 October 2026 for jewellery precious-metal fineness and designation.
- 0.05ct diamond means a very small diamond by weight; since 1 carat is 0.2g, 0.05ct is about 0.01g. Its market effect still depends on cut, color, clarity and whether it has reliable documentation. The GIA 4Cs diamond-quality guide explains those quality factors.
How to judge the 4,700 figure
- Confirm currency and purchase date.
- Find the net platinum weight from invoice or reweighing.
- Compare the same brand and same style as new retail, not only metal recycling value.
- Get a separate same-day resale/recycling quote if you care about liquidation value.
Write the comparison down as four columns: the exact ring specification, new retail replacement, cash resale offer, and any exchange credit with conditions. A store credit requiring additional spending is not equivalent to cash. Ask each dealer what part of its figure covers the metal, stone and complete setting, and whether charges are already deducted.
If 4,700 is RMB for a new branded retail ring, it may include design, labour and store margin. Without net weight and date, however, there is not enough information to label it cheap or expensive.