Hallmarks and Precious metal content stamps in jewelry

Jewelry and other products made in gold and silver are marked according to their content of precious metal. The most common silver alloy (alloy is a mix of different metals) in jewelry making is ”925”, more commonly known as ”Sterling Silver”. It is marked with [925], which stands for 925/1000 silver (92.5%). The most common gold alloy is 18K which stands for 18/24 parts gold. It is marked either [18K] or [750] for 750/1000 parts gold (75%).

In most cases they are also ”hallmarked” with the brand specific stamp of the goldsmith responsible for the production of the product in question. Gold has to hallmarked by law in most countries.

The hallmark and the metal content stamps are your guide to know you are getting what you are paying for. Keep a lookout for the [PL] hallmark.

102 Carat diamond for sale on Sotheby’s London

world record diamond for sale on sothebys

What is considered the largest, purest diamond ever found, a 102 carat brilliant cut diamond is up for auction on Sotheby’s London. It’s anticipated to reach a price of more than $30M.

But what makes it so rare? For a starter, only 7 stones over 100 carats with colour grade “D” has been brought to action, ever..

D is the highest classification of diamond colour and makes it extraordinarily white. The cut of the stone took 6 months, and the combination of symmetry, colour and the fact that it is both externally and internally flawless makes it extremely unusual. The diamond falls under a category know as 11a, where only 2% of all diamonds falls.

Then, like a cherry on top, this is the only D-coloured brilliant cut diamond over 100ct ever to be auctioned.

Is this not the perfect gift for your wife or girlfriend for Valentines? She’s worth it, right?

Pictures: Courtesy of Sotheby’s

Rhodium on my wedding ring – What you need to know!

What is Rhodium? Do I need it? What does it mean to have a ring that is “Rhodinated” and finally, Should i do it?

We often get the question from customers looking to invest in our white gold engagement rings. We will try to sort out these questions once and for all.

Rhodium 45Rh Picture by HEINRICH PNIOK

What is Rhodium?

Rhodium is a noble metal and part of the platinum group. It is one of the rarest and most valuable precious metals on earth. Precious metal miners most commonly find in nickel and platinum ores. We use most of the rhodium mined in catalytic converters in our cars, but there are some more use cases for rhodium, and this is where jewelry enters the stage. Let us go back to the first half of the 20th century, because this is where things get interesting, and this is when Rhodium starts it’s interesting journey to become almost a standard in jewellery making.

a ban on platinum

During World War 2, platinum was banned from use in jewellery. Because of it’s inherent properties like hardness and purity the American military  started laying their hands on whatever platinum they could find. They also banned jewellers from using platinum. Up until then white gold was more or less unheard of. Jewellers There was different alloys (mixes) of yellow gold, but when platinum disappeared from the jeweller’s workbenches they did whatever they could to replace the popular metal that platinum was. Hence, white gold was born. To get it straight once and for all, there is no metal called white gold in nature.

What is white gold?

White gold is simply an alloy of gold and some other metal/metals that even out the yellow hue of gold. It makes it less golden and more white. Our 18K white gold contains 75% gold and 25% palladium, but through the years white gold has had many different alloys. The “white” of white gold is a modified truth. White gold is more grey/off white than white. To compare it to something most people can relate to, take a look at your kitchen sink. Stainless steel is close to the natural color of white gold. So, white gold solved the problem with the ban on platinum. But customers still wanted the ice cold white appearance they were used to. Enter rhodium!

A money making machine!

By using a process called electroplating jewellers started covering the “not-so-white” surface of the white gold with a thin layer of crisp, white rhodium. The customers were just as happy as before, but only for a while. You see, unlike pure platinum, rhodium wears off, leaving a scratched and worn surface. The result? The off white of the white gold shines through. Every two years or so, the customer has to return to the jeweller. The Jeweller removes the rhodium on the ring and electroplates it once more. He charges his customer for half an hour or so. What a money making machine! That gives you the answer to your question, “should i do it?”. In our opinion, no. Instead, accept the off white color of white gold, it’s really kind of beautiful. Your jeweller needs rhodium more than you do.

Sources: Wikipedia, Paulalindgren.com
Read more: Our engagement rings