Turning grams into dollars: How to weigh gold at home

That gold chain collecting dust at the back of your drawer may be worth more than you expect. With the help of a precise scale, you can get an estimate of what you have in grams with a calculable value.

Knowing how to weigh gold is the starting point. A piece’s karat purity tells you how much of that weight is actually gold, and the current market price helps you figure out what that gold is worth.

You can take all three steps at home. Here’s how to do it.

How to measure gold weight at home: 4 steps

You don’t need much to weigh gold at home; a digital scale and a small tray or container for holding delicate pieces will do.

What matters more is how you use those tools. A few small details, laid out in the four steps below, can make the difference between a useful weight and a misleading one.

1. Choose a scale that measures in grams

Your baking might be top-notch, but the scale you use to measure flour may not be precise enough for weighing gold. Many kitchen scales round to the nearest gram, which is a pretty big margin when the piece you’re weighing is only a few grams. A digital pocket or jewelry scale will give you a much more precise reading. But for a rough estimate, a digital kitchen scale that rounds to one decimal place will do.

Once you have a sensitive enough scale, place it on a hard, level surface. If it came with a calibration weight, calibrate it according to the manufacturer’s instructions before you start. 

2. Give the piece a quick clean

You don’t have to restore the jewelry to showroom condition to get its weight. You just don’t want dirt or debris to become part of your measurement.

A gentle wipe with a soft cloth should be enough to clean your jewelry for an accurate weight. Skip aggressive scrubbing or chemical cleaning products, especially if you don’t know much about the piece or the stones set in it — the wrong cleaning method could damage the jewelry.

3. Look at what else you’re weighing

At-home estimates can get a little fuzzy when your jewelry contains more than just gold. A 10-gram ring set with a one carat diamond doesn’t mean it has 10 grams of gold. The same goes for jewelry with non-gold clasps and decorative materials.

If you can remove the non-gold extras safely, weigh the gold by itself. If you can’t, don't dismantle your jewelry for the sake of a calculation. Record the total weight and keep in mind that some of those grams may belong to something other than gold. A diamond’s carat measures its weight, and one carat weighs 0.2g. If you know the exact carat, multiply it by 0.2, then subtract it from the total number on the scale.

4. Place the piece on the scale and record the weight

Place the piece in the center of the scale and give the reading a moment to settle. For loose chains or pieces that won’t sit neatly on the scale, put them on a small tray. Be sure to put the empty tray on first and press “Tare,” which resets the display to zero so the scale doesn't count the weight of the container. Then, write down the weight in grams.

If you have a pile of jewelry in different karat purities, resist the temptation to weigh everything together. A 10K ring and an 18K ring contain very different amounts of gold, even if the number on the scale is exactly the same.

Common units of measurement for gold weight

The unit you measure your gold’s weight in makes all the difference in your value estimate calculation. Grams are usually the easiest choice for jewelry, but you’ll also see gold measured in troy ounces and pennyweights:

• Grams (g): A practical unit for small amounts of gold and individual pieces of jewelry, which makes it easy to calculate value (like with Unvault’s Gold Melt Value Calculator) when the gold price is listed per gram.
• Troy ounces (ozt): The standard for weighing precious metals; commonly used for bullion like gold bars. One troy ounce measures 31.1035 grams, or slightly more than a standard ounce (28.35 grams).
• Pennyweights (dwt): A traditional unit that’s not as common as troy ounces, but is still used by some jewelers and gold buyers. One pennyweight equals about 1.555 grams, and 20 pennyweights equal one troy ounce.

Understanding gold purity and karats

Like we mentioned earlier, the number on the scale isn’t necessarily the amount of gold a piece has. Unless your jewelry is 24K gold, some of that weight comes from other metals mixed with the gold.

Karat tells you how much of the metal is gold, measured in 24 parts.

You can often find the karat purity stamped somewhere inconspicuous on the piece, like inside a ring band or near the clasp of a necklace or bracelet. But treat the hallmark as a useful clue, not definitive proof of purity. A piece may have been altered or repaired at a different karat purity after it was made, and there’s no official oversight that guarantees the stamp is accurate.

The karat purity is only part of how gold is valued. A jeweler or a platform like Unvault can test the metal during a valuation instead of assuming the stamp accurately reflects its purity.

How to calculate your gold’s value

Once you have the piece’s weight and purity, you can estimate roughly what it’s worth with the help of one more number: the current market price of pure gold per gram.

The formula you’ll use to get the gold’s value is:

Weight × purity × gold price per gram = estimated gold value

Say you have a 10-gram piece of 14K gold. Since 14K gold is about 58.3% pure, the calculation looks like:

10 x 0.583 = 5.83 grams of pure gold

If gold were trading at $100 per gram, you’d then calculate:

5.83 x $100 = $583

In this hypothetical, the piece contains about $583 worth of gold.

That number (also called melt value) is a starting point, not a guaranteed offer; it only considers the gold itself. Gemstones, craftsmanship, condition, and brand can affect what the entire piece is worth, and any non-gold components included in your original weight will make the estimate less precise. If you sell the piece to a reseller, like a pawn shop or jeweler, they may give you a lower number to account for their overhead.

Get a free gold valuation with Unvault

With the right scale and a little math, you can get a good sense of your gold’s value. But if you want to sell your jewelry, you’ll eventually need to know what the piece itself — not just the gold it’s made of — is worth.

Unvault gives you a free initial valuation from a photo in about 60 seconds. If you decide to continue, you’ll get a shipping label to mail the piece in for more detailed testing. Our team of experts will record the appraisal process on video. 

Once you receive the final offer, you’ll decide whether to accept or reject it. And if you’re still figuring out where to sell jewelry, there’s no commitment to sell it to Unvault just because you got a valuation. Get the number first, then figure out what makes sense for your situation.

Upload a photo to get your free valuation today.

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