In the Amethyst trade, these stones would sell in a variety of colours, from $2 per carat to $20 per carat. People strove to find the deepest colour, and free from inclusions.
Then about 20 years these showed up - rich, dark colour, clean, the top quality (this is a 20 carat stone):
It is Chinese made synthetic, and cost at the time about $2 - $7 to make. At the time they told everyone it was a new mine, and the Brazilians and Africans nearly went out of business with their natural stones. Now there is a test to differentiate it, but it is complex and expensive, and even today costs about $20 per stone - so uneconomic, and now every fine Amethyst is priced as a synthetic.
So in other words, all fine Amethysts are now treated and priced the same, if they show no characteristics of natural. All fine Amethysts are priced as synthetic, even if natural. Previously a flawless, perfect stone was the most valued, the highest price. Now lower quality stones, with colour variation and inclusions, are valued higher as it is clear they are natural.
As to the 2915-1 bezels, perfect repros are coming. We cannot stop them In fact, to a large extent they are already here, and to try and stop them by withholding information is a fools endeavor - causing only a delay of the inevitable when 2915 bezels are reproduced that simply cannot be differentiated. (But I think we are already there).
They are after all a ring of metal engraved to specific specifications. In my previous life, finding an engraver to do this would be simple.
Then we have to be pragmatic, and ask, so what?
With the price of 2915's headed to a median of $250,000 then the bezel becomes a smaller part of the value. I have heard of some dealers paying $20,000 for what they believed an original bezel. So still a far smaller percentage of total value than, say, a DO90 bezel on a 145.012.
We must reach a point where the reproduction bezel will be indistinguishable from an original. There is no point in bleating, its coming. Ther is no point withholding information.
The question is as a collector, what to do I do about it?
My own view is to look at a bezel on a watch, and ask does it look right to me. I can, I think, immediately recognise and dismiss any bezel made with a laser engraving, or modified from modern bezels, or even an obvious reproduction.
We then look to the profile of the bezel, and the engraving itself. The problem is what do we compare it to? These bezels were thought to be made originally with a Pantograph. Now we hear an expert pronounce another method as well, this one producing serifs. I believe there is variation in the engravings, and the problem is who can say for sure that a bezel is original? Perceived wisdom already suggests there are at least two distinct styles.
While wisdom might pronounce there are only two variations, I have seen no proof. Because how can we obtain proof? I dont think these were made so mechanically that there is no variation, but I do not know.
We can only make educated intuitive guesses, and decide how much value to attribute to the bezel when buying the watch.
When we reach the point of indistinguishable bezels, I do not think it will make a difference to the price of 2915's. They will all be priced as though they have repro bezels, but the ones that are seen to be incorrect will be penalised.
I also think that a good repro bezel is not cheap - especially if prepared and distressed to correctly match a watch. It is a skilled job and not something any one can do - after all if they could they would. (and the ones who can you can bet are already doing it - not telling anyone like the Chinese Amethysts).
The problem circles back, to finding a confirmed genuine bezel to copy from.
In conclusion, if I were buying, I would want a 2915 bezel that looked right as far as I know, which so far is pretty much as
@Dash1 says.
The price of a 2915 nowadays has become so high, a perfect repro bezel is inevitable.
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