There seems to be some confusion with the difference between solid gold and pure gold, and I’m going to clarify this for you right now.
Solid gold refers to using all gold for a particular item (often for jewelry). In a sense, it is the use of just gold as the construction material of a particular piece. Things that are not solid gold can be, say, gold filled or gold plated.
Pure gold refers to the quality of the gold. I use the word “quality” loosely. Pure gold means that it is 100% gold (actually, it means it is .999 % gold). Gold is a soft metal and making things with pure gold can render a soft or weak item. To strengthen the gold, other metals are often added which dilutes the purity. There is a balance between the percentage of pure gold vs. the strength. When other metals are mixed in to gold, it is know as a “gold alloy”. An alloy is two or more metals that are combined.
Not so Black and White
So now I am going to (unintentionally) confuse you just a bit… We know that 18k gold is not pure gold, but some people may consider 18 karat gold NOT to be solid. 18k gold is 75% pure because it is an alloy, made 25% with other metals.
I understand the argument some people may make here. I bring this up so you can fully understand what is going on here. Some people would not consider anything made of a gold alloy to be solid. For the purpose of this conversation, I am going to say that a gold alloy is considered gold, and a ring made of a 18k gold is still solid gold if the 18k gold is through the whole piece. Conversely, we can say that ring is not “solid gold” if it were “gold plated” or “gold filled”.
For investment value purposes, we consider the amount of actual gold that is present. I understand that that jewelry and other things made of gold may have an additional value associated with the artistry of the item, but for investment purposes I am referring just to the vaue of the gold. This is important when trading gold as currency.
I tried to make that clear. I’m just learning how to communicate with a blog, so if you have questions, please leave your comments and I will do my best to answer.