Introduction: A new necklace design becomes a finished piece through drawing review, CAD adjustments, wax model checks, and careful stone setting.
Independent jewelry designers usually start with a sketch, a reference photo, or a style borrowed from a lookbook. What they rarely have is a clear picture of what happens between that first drawing and the necklace that arrives in a box. The gap is where most of the risk lives: an elegant pencil line that cannot be cast, a center stone that sits too high, a bail that flips. This walkthrough follows the path a new design takes inside a custom lab grown diamond necklace manufacturer, from the first technical review of a drawing to the wax model, the setting bench, and the final sample that becomes the reference for everything made afterward.
A custom project can start in two ways. A designer sends an original drawing with measurements and stone intentions, or a buyer selects a direction from an existing style library and asks for changes. Both routes land in the same place: a technical review, where an artist's line turns into millimeters, gram estimates, and real metal behavior. Designers are often surprised by how much of this conversation is about thickness. A drawn bail can look elegant as a thin curve, but that same curve may not pass a chain comfortably or survive daily wear once it exists in 14k gold or platinum. This stage also settles material decisions that affect everything downstream. The center stone may be grown by HPHT or by MPCVD, and the metal may be 10k, 14k, or 18k gold, or platinum. Each option shifts weight, color, hardness, and cost, so locking those choices before the CAD model is built saves a rebuild later. Shared vocabulary matters here too; trade bodies such as the International Diamond Council maintain standard wording for describing diamonds, which keeps stone conversations precise between a designer and a workshop. If the necklace belongs to a set, the same review usually covers matching earrings or a ring, because carrying one center stone size and one metal tone across three pieces is far easier when it is planned up front.
CAD is where the design stops being flat. The modeler builds the pendant, bail, and stone seats in three dimensions, then renders the piece on a virtual neck so the proportion reads at real scale. What follows is a loop rather than a straight line: render, review, adjust, render again. Experienced designers treat these rounds as the cheap part of a project, because one millimeter changed on screen costs nothing compared to one millimeter changed after casting. A custom lab grown diamond necklace manufacturer will typically expect two or three passes before the model is approved, and each pass usually raises a question the drawing never asked.
The CAD stage exposes details a drawing cannot show. Prong thickness, seat depth, the air gap behind the center stone, the wall thickness of the bail, and the clearance the accent stones need all become real numbers, and they have to work together. Modelers also build in casting shrinkage, since molten metal contracts as it cools; a bail opening that closes by a fraction of a millimeter during casting can stop a chain from passing through. Reviewing the model is also when the estimated metal weight and stone count appear, which is often the moment a design becomes affordable, or stops being affordable.
The approved CAD file is used to grow or cut a wax pattern, the physical twin of the digital model. Holding that wax changes how a designer thinks about the piece. Weight, balance, and the way a pendant hangs become obvious in the hand rather than on a screen. Wax review also shows where each stone will sit: whether the center stone sits high enough to catch light or low enough to stay protected, and whether the edges will press against skin during a full day of wear. Wax casting research shared through the Santa Fe Symposium treats this physical step as central to jewelry manufacturing, and most workshops still prefer to approve a wax before committing metal.
Once the wax is approved, it is invested in a plaster mold, burned out, and filled with molten metal. What comes back is a rough casting: sprue stumps, a dull surface, and no stones at all. The bench work that follows is where the necklace starts to resemble the render. The piece is cleaned, filed, and pre-polished before the center stone is set, because reaching a seat is much harder once accent stones are already in place. Setting order matters: center stone first, accents after, then final polish, and often rhodium plating on white gold so the finish reads consistently across the whole pendant. End-of-line checks are simple but never optional. Settings are tested for tightness, the pendant is checked for symmetry, the bail is checked for chain clearance and how freely it rotates, and the clasp is opened and closed until it feels right. DCA jewelry education materials emphasize that cut and finish are what a customer actually sees, which is exactly why these small inspections carry so much weight. The first approved sample then becomes the reference piece. If the design later moves into repeat or wholesale runs, the workshop works back to that sample rather than back to the original drawing. How long each stage takes depends on the complexity of the design and how quickly design decisions travel back and forth.
Turning a new necklace design into a finished piece is a sequence of translations: a drawing becomes a technical review, the review becomes a CAD model, the model becomes a wax, and the wax becomes cast metal that finally meets its stones. Each step catches something the previous one missed. For independent designers, the practical takeaway is that most surprises are decided early, at the drawing review and the wax, not at the polishing bench. Anyone who wants to see how these options come together in practice can review the customizable lab grown diamond necklace listing, which shows the metal choices, center stone routes, and set development options discussed here.
A：The design first goes through a technical review that converts the drawing into measurable dimensions and confirms metal and stone choices. It then moves into CAD modeling, where the pendant, bail, and stone seats are built in three dimensions and adjusted over a few rounds. An approved model becomes a wax pattern that is inspected by hand, then cast in gold or platinum. After casting, the piece is cleaned and pre-polished, the center stone and accents are set, and final polishing, plating, and quality checks finish the necklace.
A：CAD review is where the design is tested as an object rather than an image. The modeler sets prong thickness, seat depth, bail wall thickness, and the clearance each accent stone needs, and builds in an allowance for casting shrinkage. Reviewers look at the rendered piece at wearable scale, check how the pendant balances, and confirm the estimated metal weight and stone count. Most projects go through two or three adjustment rounds, and this is usually the least expensive place to fix a problem.
A：A wax pattern is the physical version of the CAD file, so it lets a designer hold the piece before any precious metal is used. That hand check reveals weight, hang, and balance that a screen cannot show, and it makes stone placement visible: whether the center stone sits at the right height and whether the edges will sit comfortably against skin. For OEM development, the approved wax also acts as a shared reference, so the workshop and the buyer are confirming the same object rather than two different interpretations of a drawing.
IDC | International Diamond Council
