Certified gold nuggets usually have estimates of purity from the source of the cert. How accurate those are is subject to debate. In this case the images indicate a high level of purity but that's all we know.
I'm not sure. I imagine a specific gravity test is done and perhaps a small piece is assayed. On a large nugget like the one linked it would surely have a significant margin of error.
Purity really does not matter with larger nuggets. The host rock or slag is so light weight in comparison (see quartz/gold combo) that the host rock is pretty much ignored unless it amounts to a large percentage of the weight.
Purity of nuggets does vary and usually they are from 21-23k. Australian nuggets are among the most pure.
Weight/eye appeal are the most determining factors. Location not so much unless it vies for one of the heaviest in an area/state/country.
bob
Registry: CC lowballs (boblindstrom), bobinvegas1989@yahoo.com
Originally posted by: derryb Edumacate me please. Do all gold nuggets have the same set gold purity and if so what is it?
Appears gold nuggets are always valued by weight and I never see any mention of purity.
From what I know the purity will vary from piece to piece. My local B&M will shoot one with their assay gun if you ask them. Gives a readout of several other metals amalgamated as well.
Most pieces I've seen under 1 Oz need to have something cool going for them shape wise or be of natural crystalline to pull any premium. Pieces over 1 Oz tend to bring a premium of say 5-20 % depending on cool factor. I've also notices that pieces larger than say 5 Oz the premium will level out as the buyer pool thins out.
For me I like a piece from 25-100 grams WITH quarts matrix which almost always adds authenticity as well as tremendous eye appeal. I'll pass on a BLOB every time. I know they aren't the go to choice for stackers, but they really spice up a coin collection and make great crossover pieces for folks that collect both coins and rocks or maybe prospects themselves.
VanHalen
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At this size they start getting pretty pricey. Not much native rock so the eye appeal soars.
Bob
Appears gold nuggets are always valued by weight and I never see any mention of purity.
Give Me Liberty or Give Me Debt
Give Me Liberty or Give Me Debt
Purity of nuggets does vary and usually they are from 21-23k. Australian nuggets are among the most pure.
Weight/eye appeal are the most determining factors. Location not so much unless it vies for one of the heaviest in an area/state/country.
bob
bob
bob
Edumacate me please. Do all gold nuggets have the same set gold purity and if so what is it?
Appears gold nuggets are always valued by weight and I never see any mention of purity.
From what I know the purity will vary from piece to piece. My local B&M will shoot one with their assay gun if you ask them. Gives a readout of several other metals amalgamated as well.
Most pieces I've seen under 1 Oz need to have something cool going for them shape wise or be of natural crystalline to pull any premium. Pieces over 1 Oz tend to bring a premium of say 5-20 % depending on cool factor. I've also notices that pieces larger than say 5 Oz the premium will level out as the buyer pool thins out.
For me I like a piece from 25-100 grams WITH quarts matrix which almost always adds authenticity as well as tremendous eye appeal. I'll pass on a BLOB every time. I know they aren't the go to choice for stackers, but they really spice up a coin collection and make great crossover pieces for folks that collect both coins and rocks or maybe prospects themselves.