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Of course there is a difference. 18k means that it isn't pure gold but an alloy. 24k equals about 100% so 18k gold is actually an alloy that contains 100/24*18 % (75%) gold. So you will of course get (25%) less money for 1 ounce of 18k than for 1 ounce of 24k gold.
18k is not homgeneous
Well, 18k white gold it is alloys of different quality of precious metal that pass 18k acid test and magnet test ... Yellow gold alloys with Rhodium plated it is not white gold ... White gold its 18k+ white gold inside and white gold outside forever !
This is an impossible question to answer. You can determine the gold value by determining the weightX karat (9k,10k,14k,18k,22k,24k) X price of gold divided by 31.1 to determine gram weight value. This does not include the cost of labor to manufacture the item. Some items are casted with very low labor costs and others can take several hours of even days to make.
To get an guestimate price you would need to know the weight of the ring. 18K gold is 75% gold not 100%. So you would need the weight, and calculate 75% of the current spot price corresponding to the weight. So say its a 10 gram ring. Find out the price of gold per gram, multiply it by 10. Then do the math 75% of what your gold gram price .. .
Yes, there is a difference between 1 gram of 18k gold and 24k gold. The difference between 1 gram of 18k and 24k gold are their purity as well as their worth. 24k(.999) gold is pure gold where as 18k(.750) isn't. You also have to know that the cost of a gram of gold is calculated first by knowing the price of a troy oz (oz) of gold. For example the price of one oz(31.1 grams) is $850 after you know how much the price is you divide the price of one oz by 31.1 grams giving you the cost of each gram after you do so if the gold is 24k then that is the cost per gram of 24k gold, if not you then take the answer you had for the 24k and multiple it for example to find the cost of 18k gold you multiple it by .750 and that is how much 1 gram of 18k gold costs. $850 / 31.1 = $27.33 (cost of 24k gold) $850 / 31.1 = $27.33 X .750 = $20.5 (cost of 18k gold) 24k(.999) 18k(.750) 14k(.585) 12k(.500) 10k(.417)
How much is 15 grams of 18k gold worth
First thing will comes to our mind about the What is the difference between 18K gold Jewelry and 18K gold Plated jewelry is the price, 18K gold jewelry is much expansive than 18K gold Plated, it usually will cost you 70-100 USD per gram 18K gold, if your chain necklace weight about 25 grams, then if will cost you 1750- ..
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A dollar
18K Gold: 18K Gold is 18/24ths, or three-quarters pure gold. Jewelry of this fineness is marked "18k" or "750," meaning 75 percent gold."
Follow the link in related links - there is a gold calculator that does it all for you!! But calculation = 18k= 75% gold 1 gram = Gold price /31.104768
As of August 4, 2014 1 gram of 18k gold is worth 18.42 in British pounds. This amount of gold is worth 31.06 in United States currency.
A dollar
If the chain is 18K gold, the price per troy ounce on December 18, 2013 was 926.78 USD. A gram is 0.032 troy ounce, so the necklace is 9.6 troy ounces. The value of the necklace is 8897 USD, but the value will vary depending on the value of the gold if the cost changes.
About 1/20th the price of solid 18k.