Keep in mind, as I’ve already said, Gemstones like Sapphire, Ruby, Emerald, Garnet, Amethyst and Citrine, will often Weight MORE than a Diamond of the exact same MM width. That’s why I put so much effort into This Chart to make it as Perfect as Possible. Jewelers use Gauges and Charts non stop! It helps them in many ways and finding an Accurate Chart is Imperative! You generally have to order in the next size up, just so the Prongs don’t get Pulled out or Compromised! They use MM Gauges to tell what Size Head to Order for a Stone. They also Measure Mountings that have Missing Stones to Determine what size fits in the Hole. Properly Measured Stones will make your Earrings Match (You don’t want a Lopsided Head)! BONUS! And for Earrings, they’ll have to make sure Both Stones have the same MM Width (Carat Weights may Fluctuate slightly). They have to Determine what Stones will Fit into what Mounting. Standard Sizes can help you Choose a Better Quality Stone that will have more Brilliance, Sparkle and Fire! That Stone will not only appear Slightly Smaller than a normal 1 Carat Diamond, but it Probably won’t Shine as much as one either. The Carat Weight is Distributed more up and down in the Depth of the Stone, than across the Width. It tells you that your Stone is not as Wide as it should be, which means, it’s Deeper than Normal. The Diamond at the store is listed as 6.1 x 6.2mm. Now look at the Charts, you see that a 1 Carat Round Diamond should be 6.5mm. Note: GIA will usually Measure Round Brilliant Cut Diamonds in 2 Spots, because most Round Stones are NOT Perfectly Round! You look on the GIA Diamond Report and you see that the Measurements are 6.1 x 6.2. Let’s say you are looking to Purchase a One Carat Diamond. This Chart can come in real handy if you want to Check the Measurements of your Stone. It compares MM Sizes to Carat Weights of Diamonds… Take a look at the Diamond MM Size Chart Below. You can get close, and this is how they do it when they’re Appraising your Jewelry with the Stones still in the Mounting, they Guesstimate according to Standard MM Sizes and what they should be. And without the Actual Depth of the Stone to Factor into the Equation, judging Carat Weight by just the Width is just a Guesstimation! Some have Thick Girdles, Tall Crowns… Some Stones are Thin and Narrow. Some are Deep (pretty much ALL Gemstones are Cut Deeper than a Diamond). You have to actually Weight the Stone on a Diamond Scale to know for sure. I say Approximate, because there is no way of being truly accurate with a mm Gauge. Once you get the Measurements of your Stone, you’ll be able to look at the Chart you Printed out, and see what the Approximate Carat Weight is. See the Diagram below of the Proper Angles and ways to Measure Diamonds and Gemstones. If the Stone is Round (and Symmetrical), just one Measurement is usually Sufficient.īut for Fancy Shapes, like the Marquise, Oval, Pear, Princess and Emerald, you’ll need to obtain at least 2 Measurements from 2 Different Sections. Usually stones are Measured at their Widest Part. Like you see below, just about every Shape of Stone is listed as 2 sets of Numbers, like 5×3, 6×4, or 8×10. You need to know the Proper Positions to get the Right Readings. You can’t just Measure a Gem anywhere and get Accurate Results.
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