Monday, March 23, 2009

Myths about Metals – or “I only buy PURE gold or silver” Pt 1

After listening to so many people relate concerns about metal allergies and skin discoloration and both reading and hearing a lot of misinformation on the subject, I decided to do some research and clear up some popular notions about the metals that go into jewelry designs. I will be doing a series of blogs this week delving into the facts and myths about Gold, Silver, Copper, Nickel, and “other” metals. Today I will talk about Gold. First though, let me touch on the “K” designation. K stands for Karat which is a measure of the fineness or pureness of gold, as opposed to a Carat which is a unit of weight for measuring the weight of precious stones. These are not to be confused with a carrot, which is a yummy vegetable (and a great doggy treat), or Carrot Top, who is just a really weird comedian in my opinion.

So you insist that you only buy PURE gold jewelry? Not unless it is 24k gold (which needs only be at least 99.7% pure gold, so even that may not be pure gold!) Unfortunately, 24k gold is extremely soft and not suitable for creating jewelry settings to hold a stone or other component. It also doesn’t hold up very well for day to day wear since it is prone to scratches and nicks due to its softness. Daily wear would conceivably gradually wear away this soft gold little by little. Any other gold is really an alloy, ie., a mixture of metals.

Here’s a listing of commonly found gold alloys and their metal contents:
22K gold (22 parts gold, 2 parts other metals) Gold -91.67% Silver- 5% Copper -2% Zinc-1.33% (This is still considered too soft for fine jewelry)
18K gold (18 parts gold, 6 parts other metals) Gold 75% (The remaining metals can be some combination of copper, silver, iron, silver, cadmium, and/or aluminum)
18K white gold (18 parts gold, 6 parts other metals) Gold 75% and either 25% platinum or palladium or 10% palladium, 10% nickel, and 5% zinc.
18K Rose Gold (18 parts gold, 6 parts other metal) Gold 75% and either 25% copper or 21% copper and 4% sterling silver
14K gold (14 parts gold, 10 parts other metals) Gold 58.3% (The remaining metals can be some combination of copper, silver, iron, silver, cadmium, and/or aluminum)
12K gold (12 parts gold, 12 parts other metals) Gold 50% (The remaining metals can be some combination of copper, silver, iron, silver, cadmium, and/or aluminum)
10K gold (10 parts gold, 14 parts other metals) 41.6% Gold (The remaining metals can be some combination of copper, silver, iron, silver, cadmium, and/or aluminum)

Note: 10K gold is the minimum karat designation that can be called “gold” in the US.

Gold labeling:
Solid Gold – a term used to describe an item that’s at least 10K gold all the way thru. Yes, that means that gold alloys can be called solid gold.
Gold Filled - applies only to items composed of a layer of gold pressed (not alloyed) onto a base metal (usually copper or brass) where the weight of the gold comprises at least 1/20th of the total weight of the item
Gold Plated – applies to items composed of a base metal (usually copper , brass, or silver) which have had a thin layer of gold deposited onto their surface thru chemical or electrochemical means.
I’m going to address Vermeil here, since it considered as a “gold” jewelry finish.
Vermeil - A product that is made from a base of sterling silver that is coated or plated on its surfaces with gold of at least 10K fineness and at a thickness of at least 2.5 microns (100/1,000,000 inch).
Gold TONED items are simply that – gold toned in color. Since there are no composition standards or even a standard definition, it is safe to assume that these items are either plated with or are an alloy of a lower than 10k gold, a copper alloy like brass, or the actual content of the metal is uncertain.

Hopefully this article has made you a little more familiar (and comfortable) with what you’re actually getting when you see these terms… and if any of you have ever felt like you got gypped because your “gold” tarnished or discolored your skin, keep in mind that only pure 24k gold will not tarnish. While higher karat golds shouldn’t tarnish (18k and above), there are things and situations that can cause even these fine metals to tarnish. Any gold alloy that contains copper can account for that green mark on your skin, and any gold alloy (even 18k) that contains nickel can cause that annoying allergic skin problem. I’ll delve more into things like allergies and how to get rid of that tarnish in future blogs!

Just remember – all that glitters is not gold – at least not pure gold! But that doesn’t mean that it isn’t beautiful or perfect for that jewelry piece! Think about your needs and your budget when selecting jewelry pieces, but don't get unnecessarily caught up in the idea of "pure gold" as your only option, because in this case, it is not your best option!

Speaking of gold, here are some beautiful gold jewelry pieces from some great Etsy artisans making use of a variety of gold alloys and gold toned metals!


1 comment:

Flight Fancy said...

Great information! thanks so much for posting, Im looking forward to the rest of the articles.

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