Written by the TreasureGuide for the exclusive use of the Treasure Beaches Report.
If you want to know the historical price trends for coins, there are several indices you can consult. One is the PCGS3000 index. The PCGS Ultra Rarities Index, tracks elite-level coins. That is one segment of the market and might not always apply to more common coins that are held by the majority of collectors.
The size of the collectible coin market is massive. Some reports show an industry that’s been sliding for years, if not decades. Other reports indicate auction sales are never higher and buyers pay record-setting prices. Of course, the health of the market depends upon the particular segment.
The PCGS3000® Index reflects the values of 3,000 specific coins. Developed by PCGS, the index is designed to reflect the opinions of experts regarding the market value of the coins and provide a view of price movements. The index is updated regularly to reflect changes and market trends and provide guidance for collectors.
The Numismatic Guaranty Company (NGC) has been tracking coin values since 1987. Along with their extensive price guide, they are also one of the largest coin grading companies in the world. The NGC tracks coin prices for virtually every type of rare and collector coin. Values are completely sortable by NGC grade, including a ‘Shop Now’ eBay link for purchasing.
Another informative index to follow is the Rare Coin Values Index (RCVI). The index tracks the percentage change in 87 United States rare coins.
The values of each coin are determined from a variety of reputable price guides and reported monthly as a percentage increase or decrease.
The values of each coin are determined from a variety of reputable price guides and reported monthly as a percentage increase or decrease.
For comparison, here is the chart for gold.
That chart isn't comletely up to date. We've seen a drop in gold prices since.
Here is the PCGS3000 index chart for gold coins. Remember the PCGS index is made for elite-level coins.
As you can see, the gold coin index of elite gold coins did not follow the price of gold. They had their own distinct trends.
Here is another example. This chart shows Morgan and Peace dollars for the same period. Like gold coins, the dollars also showed a peak back in late eighties, but then was fairly constant after returning to more normal levels.
The indices can be useful, to some extent, but there are many limitations and factors to take into account. The indices might be useful, but other sources of information should also be consulted.
For Spanish shipwreck coins you can check the auction archives. There is the matter of inflation to take into account too.
Here are some links if you want to learn more about the indices.
Electric roads are one of the most promising ideas to be worked on in recent times – highways equipped to charge vehicles dynamically as they move, using inductive or conductive systems embedded beneath the surface.
With trials underway in multiple countries, electric roads are now drawing global attention. But despite strong technical progress, widespread adoption remains challenging due to cost, infrastructure demands, and limited technological maturity...
Here are some links if you want to learn more about the indices.
A Closer Look at Rare Coin Values and Price Indexes
And the following link to a site that provides a number of coin indexes.
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A 4.4 mile stretch of highway in Florida, State Road 516, will soon recharge EV vehicles as they drive down the road.
There are embedded inductive charging coils beneath the pavement that generates a magnetic field that charges compatible EVs without stopping or plugging into a charger.
Up to 200 KW for trucks and about 50 KW for passenger cars is enogh to extend the range of the vehicles.
Construction began in early 2026 and a partial opening is expected by 2027. The cost is around $500 - $550 million total with about $14 million of that being for the charging system.
Electric roads are one of the most promising ideas to be worked on in recent times – highways equipped to charge vehicles dynamically as they move, using inductive or conductive systems embedded beneath the surface.
With trials underway in multiple countries, electric roads are now drawing global attention. But despite strong technical progress, widespread adoption remains challenging due to cost, infrastructure demands, and limited technological maturity...
Here is the link for more about electric roads.
Inside the engineering of electric roads that could transform EVs
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Not too long ago I talked a little about identifying Kang-Hsi porcelain.
Here is another good resource.
---🧭 Quick Comparison Table
| Feature | Kangxi (1662–1722) | Later Qing / Modern |
|---|---|---|
| Blue color | Deep, vibrant, shaded | Softer, greyer, or too uniform |
| Brushwork | Bold, lively | Finer or overly perfect |
| Porcelain body | Slightly greyish | Whiter, smoother |
| Foot rim | Rough, gritty | Smooth, clean |
| Marks | Archaic script, sometimes absent | Often apocryphal, too perfect |
| Enamels | Famille verte, bright | Famille rose, pastel, smoother |
And here is that link.
The Chemistry of Porcelain: Understanding the Value of Hard vs. Soft Paste
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| Beach Beig Extended at Fort Pierce. From Sufguru.com beach cam. |
The Beach Goes On. They are continuing to extend it to the south. I'm not so worried about what they are covering up here, but that sand will eventually end up way to the south and just when the beach cobs began to reappear again. It should take a littlwhile before it washes away. Any bets on when the next renourishment starts?
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| Surf Chart from Surfguru.com. |
A little bump midweek, but nothing special. That is probably over until the hurricanes start stirring.
Good hunting,
Treasureguide@comcast.net