Diamond value matrices

By the end of this page the diamonds in your workspace have a value, taken from a price table that is yours: WITVT supplies no diamond prices of its own.

What a matrix is

A gem value matrix is a grid of per-stone prices for one diamond cut. Rows are clarity grades from F and IF down to I3; columns are colour grades from D to N; and the grid is repeated for each carat range you define. When an item in the workspace holds a diamond of that cut, WITVT finds the range its carat weight falls in and reads the price at its clarity and colour. Nothing is interpolated or multiplied: the stone is worth exactly what you wrote in that cell.

Matrices live on your account, so they need a free sign-in, and they apply in every browser you sign in from. A free account includes 1; WITVT Pro removes the limit, which matters once you price more than one cut.

Creating a matrix

1. 1

   Open Gem value matrices

   Sign in, open your avatar menu in the header and choose Gem value matrices, or go to Settings, Gem Matrices. The page lists your matrices with their cut, description and whether each is active.

   Screenshot coming soonThe Gem Value Matrices page with one active round brilliant matrix and the Create New Matrix buttongem-matrices-list · desktop

2. 2

   Create it

   Press Create New Matrix. The gem type is diamond (the only type supported today). Choose the Cut Type, add a description such as the price source and date, leave Active ticked, and press Create Matrix. The new matrix starts with five carat ranges, 0.5 to 0.75, 0.75 to 1.0, 1.0 to 1.25, 1.25 to 1.5 and 1.5 to 2.0 carats, with every price at zero.

3. 3

   Fill in the prices

   Press the Edit Matrix Data icon on the matrix to open the editor. Each carat range is a section with its Min Carats and Max Carats and the clarity by colour grid. Type the price you pay per stone into each cell you use; cells you never buy can stay at zero. Add Carat Range adds one above the last, and the bin icon removes a range (the matrix always keeps at least one). Press Save.

   Screenshot coming soonThe diamond matrix editor with a carat range’s min and max fields and the clarity by colour grid of pricesgem-matrix-editor · desktop

4. 4

   Check a stone

   Back in the workspace, open an item with a diamond of that cut, or add one with its clarity and colour set. The stone’s row in the gems list no longer says “Not priced”, and the breakdown’s Gem value row shows the price from the grid. With Live off, press Calculate updated values first.

How a stone is matched

• The matrix must be active, for diamonds, and for the stone’s cut. Keep one active matrix per cut.
• Ranges run from the minimum up to but not including the maximum, so a 1.0 ct stone falls in the 1.0 to 1.25 range. The top range includes its maximum, so 2.0 ct matches 1.5 to 2.0.
• The stone needs a clarity and a colour; the price is read at that cell. A price of 0 is a real price.
• Lab-created diamonds use the same matrix as natural ones; keep a separate description, or a separate account, if you price them differently.

Why a stone is not priced

A diamond row shows Not priced: check gem matrix when any of these holds: there is no active matrix for its cut, its carat weight is outside every range in the matrix, or its clarity or colour is not set. The stone still comes off the metal weight and contributes $0, so the item total is lower than it should be rather than wrong. Add the missing range or grade, save, and recalculate.

Stones and other materials covers entering the stones themselves.