Urban Sterling

Urban Sterling Mason Mignanelli • Conceptual jeweller. Narrative-driven silver and gold work. Newcastle studio open, DM for appointments. Read my book ↓

28/05/2026

I tell my people this all the time: if you want a financial investment, do not buy jewellery. Go buy a 1-ounce 24ct bullion coin and put it in a safe.

Modern fine jewellery is an aesthetic purchase, an emotional heirloom, and a piece of wearable engineering. When you buy a bespoke ring, you are paying a massive premium for a craftsperson to bend a stubborn, raw element to their will so you can safely wear it on your hand for the next fifty years without the stones falling out.

You are buying functional art. You don’t look at a # painting and calculate its value based on the wholesale cost of the canvas and the oil paint. You shouldn’t do it with your jewellery either

25/05/2026

I mentioned in the video that rose gold is just yellow gold pushed warmer by adding copper. But what I didn’t mention is that it wasn’t always called rose gold.
In the 19th century, it was known globally as “Russian Gold.”

The famous jeweller Carl Fabergé was one of the first to heavily incorporate this copper heavy alloy into his bespoke pieces, most notably in his legendary Imperial Eggs. Because the Russian elite were the only ones commissioning and wearing it, that distinct, coppery pink hue became entirely synonymous with their empire.

The name “Rose Gold” is a relatively modern marketing rebrand.

24/05/2026

I mentioned in the video that Mystic Topaz gets its colour from a process called Physical Vapour Deposition (PVD). But this technology wasn’t actually invented to make cheap rocks look pretty. It was invented for heavy industry.

If you walk into a hardware store and look at high end drill bits or saw blades, you will notice they often have a bright gold or iridescent sheen to them. That is a PVD coating of Titanium Nitride. Industrial manufacturers use it because it creates a hard, microscopic surface layer that reduces friction and extends the life of cutting tools.

At some point in the 1990s, the jewellery industry realised that if they used this machinist’s trick and applied it to the bottom of a cheap, colourless Topaz, it would act like an iridescent mirror.

When you buy a Mystic Topaz, you aren’t buying a rare geological phenomenon. You are wearing the exact same surface treatment used to coat a masonry drill bit.

21/05/2026

Engineers take a YAG crystal, remove a tiny fraction of the Yttrium atoms, and replace them with Neodymium to create a laser.

But what does an Nd:YAG laser actually do?

Because the Yttrium “engine block” is so rigid, this crystal can handle an absolutely crazy amount of energy without shattering. When you pump it with high intensity light, the Neodymium atoms get excited and fire off a beam of infrared radiation.

That beam is so powerful and precise that it is the backbone of modern heavy industry and medicine.

If you go to a clinic to have a tattoo blasted off your skin, the machine they use is an Nd:YAG laser. If you watch a robotic arm slice through a half-inch sheet of solid titanium in an automotive factory, that’s also an Nd:YAG laser.

20/05/2026

In 1942, the government banned platinum for civilian jewellery because it was a “strategic war material.” But the military wasn’t making engagement rings. What did they actually need it for?

Chemistry and engines.

Platinum is one of the greatest chemical catalysts on Earth. This is why another platinum group metal (palladium) spiked so hard in price a a while back, it was needed for making catalytic converters.

During WWII, it was desperately needed to manufacture high octane aviation fuel and the nitric acid required for explosives. Without platinum catalysts, bomber planes couldn’t fly, and artillery shells couldn’t be made.

Furthermore, platinum is incredibly heat-resistant and doesn’t corrode. The military needed massive amounts of it to build the heavy duty spark plugs for combat aircraft engines, ensuring they wouldn’t melt or misfire at high altitudes.

If you were a civilian demanding a platinum wedding band in 1942, you were quite literally depriving an aircraft engine of the parts it needed to stay in the sky. So, the jewellery industry pivoted to white gold, and an entire new aesthetic was born.

18/05/2026

I mentioned in the video that 24-carat gold is close to useless for fine jewellery, but people always say, “Wait, didn’t the ancient Egyptians and Romans use pure gold?” Yes, they did. But ancient jewellery was incredibly chunky, heavy, and usually featured bezel-set stones where massive walls of metal held the gem in place.

Modern engagement rings are completely different.

Lots of people today want delicate bands and tiny, microscopic prongs so the stone looks as exposed as possible. If I made a modern, four-prong engagement ring out of pure 24k gold, it would be a disaster.

Pure gold is so soft you can literally bend it with your fingernail. The first time you reached into your purse or bumped your hand on a steering wheel, those pure gold prongs would simply peel back like a banana, and your diamond would hit the pavement.

We don’t drop the purity to 18k or 14k to save money. We do it to make sure the ring survives longer than 6 months.

17/05/2026

Red Beryl lacks the marketing machine of Diamond or Emerald. But it actually used to have a very specific trade name: Bixbite. And then they ruined it.

It was named after Maynard Bixby, the American mineralogist who first catalogued it in Utah. So why don’t we call it that today? Because the exact same mineralogist also discovered a completely different, visually useless black metallic rock and named it Bixbyite. Awful branding.

Gem dealers, miners, and buyers were constantly getting the two confused, leading to chaos in the market. The World Jewellery Confederation eventually had to step in and formally ban the use of the name Bixbite in official grading just to stop the errors.

It is incredibly difficult to build the royal prestige and consumer demand of an Emerald when your own industry can’t even agree on what to call you.

15/05/2026

From a jeweller’s perspective, working with Red Beryl is terrifying.

Just like its green sibling (Emerald), Red Beryl is classified as a Type III gemstone. This means that by its nature, it forms with a large amount of internal inclusions, fractures, and structural stress points. It is notoriously brittle.

When you’re setting a standard Emerald into a ring, you have to be incredibly careful not to apply too much pressure with steel tools, or the stone will shatter.

But if the absolute worst happens and I break a client’s Emerald, I can usually source a replacement. It will be expensive, but the stones exist on the open market.

But if I accidentally chip a Red Beryl at the bench, I am in serious trouble. With the entire planet only producing a few hundred carats a year, finding a replacement stone with the exact same dimensions, colour saturation, and clarity is practically impossible.

14/05/2026

Different minerals have different densities, which dramatically changes their physical size. But even if you’re shopping for a diamond, carat weight can still mess you up.

This is because of how lapidaries physically cut the stone.

If you buy a 1 carat round brilliant diamond, it should ideally measure about 6.5 millimetres across the top (a round brilliant has a standardised optimal recipe). But if the gem cutter was trying to preserve as much weight as possible from the rough crystal, they might cut the stone too deep.

They hide all that extra carat weight in the pavilion (the bottom of the stone).

Because the weight is stretching downwards instead of outwards, that 1 carat diamond might only measure 6.0 millimetres across the top. You paid for a 1 carat stone, but on your finger, it might look like a 0.80 carat stone.

But it gets worse. Hiding weight at the bottom of the diamond actually hurts its optical performance. A brilliant cut relies on precise geometry to act like a mirror, bouncing light straight back to your eye. When the pavilion is cut too deep, that geometry breaks. The light entering the top just leaks out the bottom, leaving you with a diamond that is physically smaller, and noticeably duller and darker in the centre.

Never buy a gemstone solely for its weight. The millimetre dimensions, and an excellent cut, are the only things that actually tell you what the stone will look like.

12/05/2026

Chromium gives rubies a cool optical quirk.

Most gemstones get their colour purely through absorption. They absorb certain wavelengths of white light and bounce the rest back to your eye. But Chromium does something extra: it is highly fluorescent.

When invisible UV rays hit a fine Ruby, the Chromium atoms actually get excited and physically emit their own red light. If you take a high-quality Ruby out into direct sunlight, it’s literally glowing a little bit.

This is why ancient texts constantly describe Rubies as holding an “internal, inextinguishable fire.” They didn’t know about UV physics, but they could see with their naked eyes that the stone was generating its own light.

11/05/2026

To create Mokume Gane, a smith stacks sheets of Sterling Silver, 18k Gold, and Palladium White Gold, and fuses them together under heat and pressure.

What I didn’t mention is what an effort that actually is.

These metals do not want to cooperate. 18k Palladium White Gold melts at roughly 1050C. Sterling Silver melts at just 890°C. If you blasted this stack with a jeweller’s blowtorch, the silver would melt way before the white gold did.

To fuse them, you can’t melt them into a liquid. You have to rely on a concept called Solid State Diffusion. The tightly clamped stack is placed into a kiln, bringing the metals right to the edge of their melting points without crossing over.

Under extreme pressure, the atoms of the different metals actually jump the borders and permanently lock together while remaining completely solid.

It’s a balancing act of heat control. One mistake, and you have a puddle of expensive, muddy grey metal.

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