The WorkbenchPricing
Carat From Dimensions
Millimetres and shape in — estimated carats out, for uncertified diamonds and coloured stones.
Start from a counter moment
The shape
Looking at the table (the flat top): which outline is it?
Cabochons and beads follow a different formula — this tool does faceted stones only.
Vernier across the girdle — twice, at right angles, if the stone looks out-of-round.
Same millimetres, different weight — density (SG) does the difference.
Refinementsoptional
Girdle, ratti, a custom SG — refine only if you need to
Reverse it
Start from the carats you want — get the mm size per shape, plus the printable mm↔carat pocket chart for your counter drawer. We’re checking whether Tools Pro is active on your account — this step opens by itself if it is.
Checking your Tools Pro membership…
Your estimate appears here
Pick the shape — or tap a counter moment above — then the millimetres and the stone, and the honest carat band appears with its range.
Weigh a parcel
Paste up to 50 stones as mm rows — per-stone estimates, the lot's total carats and grams, and a CSV for the stock register. We’re checking whether Tools Pro is active on your account — this step opens by itself if it is.
Checking your Tools Pro membership…
Keep the stone
Name and keep up to 20 measured stones, and compare any three side by side — repair-counter memory. We’re checking whether Tools Pro is active on your account — this step opens by itself if it is.
Checking your Tools Pro membership…
Sellers also ask
Stone mounted hai, tol nahi sakta — kitna accurate hai mm se carat nikalna?
With a measured depth, honestly within about ±6%; if we estimate the depth for you, ±10–12%. That is good enough to catch a wrong claim ('yeh 1 carat hai') but not good enough to certify — for a sale document, get it weighed loose or lab-certified.
CZ aur diamond same size ke hain, phir carat alag kyun aa raha hai?
Because CZ is about 60% denser — a 6.5 mm CZ actually weighs ≈ 1.65 ct while a 6.5 mm diamond weighs ≈ 1 ct. Sellers quote CZ in 'diamond-equivalent look' sizes; scales weigh the truth. The tool shows the real weight for whichever stone you pick.
1 carat kitne gram ka hota hai?
One carat is exactly 0.2 grams, and it splits into 100 cents — so a 0.75 ct stone is 75 cents, or 0.15 g. Carat here is stone weight; the karat mark on gold (22K, 916) is purity and a different thing entirely. Every estimate here shows carats, cents and grams together, so you can quote in whichever unit the buyer in front of you uses.
1 ratti kitne carat ka hota hai?
At the common 0.182 g ratti, one ratti is about 0.91 carat — so a 5 ratti pukhraj works out near 4.55 ct. Ratti is not a fixed unit: it runs from roughly 0.121 g to 0.191 g depending on the region and the trade you buy in. Switch ratti on here, set your own market's gram value, and the estimate is shown in ratti beside the carats.
Estimate scale ke weight se kam aa raha hai — kyun?
Usually the girdle or the depth. A thick girdle carries weight that the outline across the top never shows — set the girdle to Medium (+2%) or Thick (+5%) and the estimate rises. And if the depth was estimated for you, the band is ±10–12%; measuring table to culet with the vernier and typing that in tightens it to about ±6%. A deep cut also weighs more than it faces up.
Can I use this for a cabochon, pearl or moonga?
Not reliably. The nine shapes here carry faceted-cut weight factors, and a cabochon's dome and bulging base sit outside them, so the figure can miss in either direction. Read it as an indication only — for moti, moonga or lehsuniya, where the ratti ask decides the price, have the stone weighed loose instead.
How many mm is a 1 carat round diamond?
About 6.4 mm across for a standard round brilliant — a 6.5 mm round reads a shade over one carat. Running it that way round, carats in and millimetres out for all nine shapes plus the printable pocket chart for the counter drawer, comes with Tools Pro. The free side runs millimetres in, carats out, with no daily cap.