What is Calibrated Moissanite Sizing?

Stones come in all shapes and sizes but today we are going to focus on a special type: calibrated moissanites. What are they measured in? How are they sized? We’ll answer these questions and more. Let’s divulge into this not-so complicated topic Rosettes!

So...What is It?

Calibrated moissanite sizing is when gems are cut to fit most standard commercial jewelry. They typically go in 0.5mm increment sizes for anything over 4mm. If it is under 4mm, sizes can go in 0.25 increments. For our moissanite and some lab-grown colored stone options, they are sold in calibrated sizes.

These gems are mass-produced and can be used in most commercial market jewelry. Typically, there’s no shortage of these gems as they are popular sizes. If you are looking for something more unique, a non-calibrated option is right for you. We will dive a little deeper with non-calibrated sizes later in the blog.

How are moissanites sized?

Unlike diamonds, moissanite are sized in millimeters. Why is that? Moissanites are measured as such because they weigh less than an actual diamond. There is about a 15%-18% weight difference between both of the stones.

So how will this affect my purchase? Moissanites are priced based on their measurements. No matter the weight of the stone, they are sold strictly on the measurements. The moissanite stones may measure different in weight but will measure close or the same in diameter.

Do carats still apply to moissanites?

We’re not trying to trick you Rosettes, but this is a yes and no answer. Let us explain! All stones have a carat weight, but are sold in different ways. Moissanites are sold by their calibrated size, not by their weight. On the other hand, diamonds are sold by their carat weight. Seems simple enough, right?!

For a better understanding, there are conversion charts to show how both the weights and sizes compare between the two.

How do mm and carat sizing compare?

Different gemstones will have different weight translations and different styles of cuts with the same diameter measurements will weigh different. A good example is a 7.5mm cushion moissanite; it is the rough weight equivalent of a 2-carat cushion cut diamond. On the other hand, a 7.5mm round moissanite is equivalent to 1.50 carat round cut diamond.

Just to make things even more confusing, a lab-grown 7.5mm round cut blue sapphire will weigh closer to a 1.75ct due to the weight density difference. Each gemstone has a different weight. Nuts right?!

At Love & Promise, we carry a full selection of Charles & Colvard moissanites that range from 2.5mm-11mm size in a variety of shapes; larger sizes can be ordered a la carte. We also offer calibrated lab grown sapphires, emerald, rubies etc. and natural gemstones too. Feel free to check out our gem selection. If you don’t see what you’re looking for, reach out to us! We may have options not listed.

You can always trust Love & Promise for our quality and commitment towards excellence. We offer our customers only quality gemstones and expertly handcrafted jewelry. All our gemstones & jewelry go through our “3x Review process” to ensure we only accept and/or ship out triple inspected products. Yup, we take excellence very seriously.

Now that you're armed with knowledge in moissanite calibrated sizing, Love & Promise is confident that your moissanite shopping has become a little easier! As always, be sure to check out our website and follow our socials to keep up with all things Love & Promise. Stay tuned for our next blog post Rosettes!