When you shop for diamond jewellery, you may see a number followed by CTW for example, 1 CTW diamond studs or a 2 CTW tennis bracelet. CTW means carat total weight: the combined weight of all the diamonds in a piece or pair.
Understanding CTW makes it easier to compare diamond jewellery and choose a design that suits your style. Here’s how it works for earrings, bracelets and pendants.
What does CTW mean?
A carat is a unit of weight used for diamonds. Carat total weight adds together the weight of every diamond in the jewellery item. It describes the total diamond weight, not the weight of the gold or the size of one individual diamond.
For example, a pair of diamond earrings marked 1 CTW contains 1 carat of diamonds altogether. If the earrings have two matching diamonds, that will usually mean approximately 0.50 carat in each ear. In a multi-stone design, the total may be divided among several smaller diamonds.
How CTW works for diamond stud earrings
For a pair of diamond studs, CTW refers to both earrings together. A 0.50 CTW pair, for instance, may have two diamonds of approximately 0.25 carat each. Check the product details for the weight of each diamond and the total for the pair, since designs can vary.
The right size depends on the look you want, your budget and how you plan to wear the earrings. A smaller pair can feel subtle and easy to wear every day; a higher CTW can create more presence. The diamond shape and setting also affect the overall appearance. Explore lab-grown diamond stud earrings in a range of shapes and settings.
How CTW works for tennis bracelets
A diamond tennis bracelet usually has many diamonds set along the length of the bracelet. Its CTW is the combined weight of all those stones. That total is spread across the full design, so it does not mean that each diamond has that weight.
When comparing bracelets, consider the CTW along with the diamond size, shape, setting, bracelet length and the look you prefer. A row of smaller stones can have the same total weight as a design with fewer, larger stones, but the two bracelets may look quite different. Browse lab-grown diamond tennis bracelets to compare styles.
What about a diamond pendant?
A solitaire pendant usually features one centre diamond, so its carat weight may describe that single stone. In a pendant with several diamonds—such as a cluster, halo or station design—the listed CTW may represent the combined weight of all the diamonds. Read the individual product description to see how the weight is presented.
If you’re choosing a pendant for everyday wear or a gift, compare the diamond’s carat weight with its shape, setting and chain length. Explore lab-grown diamond pendants and necklaces for classic solitaires and other designs.
Does a higher CTW always look larger?
Not necessarily. CTW tells you the combined weight of the diamonds, but it doesn’t tell you exactly how large they will appear from the top. Shape, cut proportions, the number of stones and how they are arranged all affect the look.
This matters especially when comparing a single diamond with a multi-stone design. A 1-carat solitaire and a piece with 1 CTW distributed across many smaller diamonds have the same total carat weight, but they will not look the same. Product photos, measurements and detailed specifications can help you compare more confidently.
What should you compare besides CTW?
Use CTW as one helpful detail alongside the rest of the product information:
- Individual diamond weight: Helpful for pairs of earrings and multi-stone designs.
- Diamond shape and measurements: These affect the face-up appearance.
- Setting style: Prong, bezel and other settings create different looks and profiles.
- Metal and craftsmanship: Check the gold karat and construction details.
- Product documentation: Review the listing for any grading report, appraisal or other documentation included with that specific piece.
For some jewellery, the diamonds are individually graded and documented; for other multi-stone designs, the product information may focus on the piece’s combined specifications. Check the product page or ask us if you’d like help understanding what is included.
Choose diamond jewellery with confidence
Once you know that CTW is the combined weight of the diamonds, comparing styles becomes much easier. Look at how that weight is distributed, consider the design’s measurements and choose the setting that feels right for you.
Shop diamond jewellery at Jacob Mercari, or contact our team for personal guidance. We offer private consultations at our Toronto studio and virtually, with insured shipping across Canada and the USA.
References:
https://4cs.gia.edu/en-us/blog/gia-diamond-grading-reports-understanding-carat-weight
