Stones and other materials
Why stones come off the metal weight, how to enter them, estimating a round diamond’s weight from its size, what gets a value of its own, and what does not.
Updated
By the end of this page every stone in a piece is entered so that only the metal is priced, and you know which stones can carry a value of their own.
Why stones are subtracted
You weigh the whole piece, but only the metal has melt value. WITVT therefore subtracts the weight of every stone you enter before it prices the metal: a 5.00 g ring with a 0.50 ct diamond is priced on 4.90 g of gold, because a carat is 0.2 g. Leave a stone out and the piece is overvalued by the stone’s weight in gold. The breakdown shows the result as Metal weight (net of stones/other).
Entering stones
Stones are entered on the wizard’s Stones step, or under Gems on the edit page of an existing item. The step is optional: press Next on a plain piece.
Add a row
Press Add a stone. A row appears with a count, the stone type and its weight. Press Edit on the row to open the stone editor.
Screenshot coming soonThe Stones step with one diamond row showing its count, type and weight, and the Add another stone buttonwizard-stones · desktopOne row per kind of stone; the count covers identical stones. Describe the stone
Choose the Stone type: diamond, diamond (lab created), moissanite, cubic zirconia, ruby, sapphire, emerald, and a dozen more, with “other” for anything else. Choose the cut: round brilliant, oval, pear, marquise, emerald, princess, cushion, heart, trilliant, baguette or other. For a diamond you can also set the clarity and colour grades; they only matter when a value matrix prices the stone.
Screenshot coming soonThe stone editor with the type, cut, size and grading fieldswizard-stone-editor · desktopWeight in carats, or a diameter for a round brilliant. Enter the size
The size selector offers Weight, in carats by default. If you cannot weigh a mounted stone, choose Diameter or Dimensions for a round brilliant and enter millimetres: WITVT estimates the carat weight from the standard proportions of the cut (a 6.5 mm round brilliant is about 1.0 ct). Other cuts take a weight only; a jeweler’s chart or the stone’s certificate gives it.
Set the count
Several identical stones share one row: set the count in the small box at the left of the row. The weight you entered is per stone, and the total is subtracted. Stones that differ in size get their own rows.
Which stones get a value
Diamonds, natural or lab created, can carry a value of their own, but only from your own gem value matrix: a table of per-stone prices by carat range, clarity and colour for one cut, set up on your account. With a matching active matrix the stone’s price appears in the breakdown as Gem value and is added to the item. Without one, the row shows Not priced: check gem matrix and the stone adds $0, so the total is conservative rather than wrong. Diamond value matrices shows how to build one.
Every other stone, from moissanite and cubic zirconia to sapphires, rubies and pearls, only reduces the metal weight. WITVT does not price coloured stones: their value depends on origin, treatment and colour in ways no table can capture, and a buyer of scrap will not pay for them. Get a gemologist’s opinion for a stone you think is valuable, and keep the setting’s metal value separate.
Other materials
Enamel, leather cords, wooden beads, glue, steel springs in clasps and glass all add weight without adding metal. The calculation keeps a place for them, which is why the breakdown row says “net of stones/other”, but the wizard and the edit page have no field for it yet, so that weight stays at zero. Two ways to deal with it today: enter the material as a stone of type “other” with its weight, which subtracts it just the same, or weigh the metal parts on their own where the piece comes apart. The AI assistant can set the other-materials weight directly when you describe a piece to it.
Checking the result
On the edit page, Jewelry item information shows the metal weight, the total stone weight and the number of stones for the piece. In the workspace, open How was this calculated? on the card: the first row is the net metal weight, and the gem value row shows what the stones added. Understanding the result explains every row.
Related
- Adding jewelry: Every hallmark and what to search for, what to do with an unmarked piece, how to weigh, and what the alloy details dialog tells you.
- Diamond value matrices: Build your own table of diamond prices by carat range, clarity and colour so the stones in your workspace are valued the way you buy them.
- Understanding the result: What each line of an item’s calculation means, why a buyer pays less than melt, what “Not priced” means, and why values change during the day.
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