Understand the market before you sell
Background, practical guides and calculating tools – written by our own valuers, gemmologists and watchmakers.
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- 9
- Guides
- 6
- Tools
- 4
- Access
- Free
- 9
Articles
Background to the market: why rates move, what regulation means and how to translate that to your own situation.
View articles - 6
Guides
Step by step through a single subject. Written to be read before you sell.
View guides - 4
Tools
Calculating aids and reference tables for gold, silver and diamond. Ready to use, without registration, at the rate of this moment.
View tools
Background to the market: why rates move, what regulation means and how to translate that to your own situation.
Troy ounce, gram and carat: the units side by side
The world market reckons in troy ounces, your scales in grams and your jewellery in carats. With these three conversions you can check any offer yourself.
Krugerrand, Maple Leaf or Philharmonic: which one sells fastest?
All three contain exactly one troy ounce of fine gold. What you get for them still differs – that lies in how well known they are, the fineness and how easily they scratch.
How does a buyer check whether gold is real?
Magnet, acid test, specific gravity and X-ray. What each method does and does not prove – and why a stamp alone is never enough.
Step by step through a single subject. Written to be read before you sell.
Recognising hallmarks in jewellery
585, 750, 925, EPNS – an overview of the most common hallmarks and what they mean.
Beginner’s guide to selling watches
Brand, reference, condition and papers. What a watchmaker looks at, and why that sets the price.
Beginner’s guide to diamond and the four Cs
Carat, cut, colour and clarity – what each term means and how heavily it counts towards the price.
Calculating aids and reference tables for gold, silver and diamond. Ready to use, without registration, at the rate of this moment.
Rate overview
Gold, silver, platinum and palladium in euros per gram and per kilo, with today’s movement.
Carat and alloy table
Every common hallmark with the fineness that belongs to it, and today’s purchase price per gram.
Diamond calculator
An indication of value based on the four C’s, the certifying laboratory and your certificate number.
Further in the knowledge centre
Questions about the knowledge centre
Are the articles and guides free?
Yes, everything in the knowledge centre is freely accessible. You do not have to register for anything and we never ask for an e-mail address. The site sets no tracking cookies either, so reading here leaves no trail.
Who writes these pieces?
Our own valuers, gemmologists and watchmakers. The name of the author is stated with every piece, together with the date and the reading time, so that you can see who stands behind the text and how current it is.
How often is the information updated?
Price-related tools always work with the rate of that moment. Articles and guides are revised as soon as regulation or market conditions give reason to do so, and the date of the piece tells you when that last happened.
May I quote from this?
Gladly, with an acknowledgement of the source and a link to the original page. That way your readers can check the context for themselves and see when the piece was last revised, which matters with figures that move.
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Our specialists are happy to explain, at the table or by telephone.