Moissanite Tools

Name: Moissanite Tools
Author: FITINY

by FITINYversion 1.0.0i★ –iRuns in the cloud

Registry namecom.fitiny/moissanite-tools

Install

Overview

Description from the maker (original English)

FITINY jewellery tools: density-corrected carat/mm, GIA grades, ISO 8653 ring sizes

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://mcp.fitiny.com/mcp

Run this in your terminal

claude mcp add --transport http moissanite-tools https://mcp.fitiny.com/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "moissanite-tools": {
      "url": "https://mcp.fitiny.com/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "moissanite-tools": {
      "type": "http",
      "url": "https://mcp.fitiny.com/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://mcp.fitiny.com/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 8, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain fitiny.com (the registry checks domain ownership)
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
… Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Otheri

More stars than 0% of the other 18379 servers in this category
Published to the registry more recently than 30% of the other 18379 servers in this category
Basic checks equal to or better than 100% of the other 18379 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Moissanite Tools safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 2 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, NexusWindows

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Spec Driven Development

by formulahendry

MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.

Runs on your computer★ 440MITUpdated 14 months ago

Install

Remote Desktop Commander

by desktop-commander

Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

Runs in the cloud★ 211Updated 2 days ago

Install

NexusWindows

by pironjulien

Windows computer use in the background: desktop apps driven without your mouse or keyboard.

Runs on your computerUpdated today

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

moissanite-tools

Grading reference and carat↔millimetre conversion for moissanite — calculated, not copied.

Why this exists

Practically every carat/mm chart on the web is calculated for diamond. Moissanite has a different density (3.21 vs 3.52 g/cm³), so applying a diamond chart to moissanite is wrong by roughly 9%:

Diameter	Diamond	Moissanite	Cubic zirconia
4.0 mm	0.24 ct	0.22 ct	0.39 ct
5.0 mm	0.47 ct	0.43 ct	0.76 ct
6.5 mm	1.03 ct	0.94 ct	1.66 ct
8.0 mm	1.91 ct	1.74 ct	3.09 ct

This is why moissanite is usually sold by millimetre rather than by carat — the same "1 carat" looks like a different size depending on the stone.

What's in here

data/grading.json    GIA colour (D–K) and clarity (FL–SI) scales, plus published

optical constants for moissanite / diamond / cubic zirconia data/sizing.json ISO 8653 ring sizes (US/UK/EU/mm), necklace lengths, stud sizes src/conversion.js carat ↔ mm for round brilliant cut, density-corrected src/sizing.js ring size conversion, necklace length and stud appearance lookups mcp/server.js Model Context Protocol server exposing all of the above

Ring sizes

Cross-border ring buying goes wrong because the systems are unrelated: a US 6 is a UK M, not a UK 6. EU sizes under ISO 8653 are simply the inner circumference in millimetres.

US	UK	EU	Inner Ø
5	J	49.3	15.7 mm
6	M	51.9	16.5 mm
7	O	54.4	17.3 mm
8	Q	57.0	18.1 mm
9	R½	59.5	18.9 mm

Sizes that aren't on the chart return the nearest listed size flagged exact: false, rather than inventing a value.

Usage

import { caratFromMm, mmFromCarat, compareAtWeight } from './src/conversion.js';

mmFromCarat(1, 'moissanite'); // 6.65 mm mmFromCarat(1, 'diamond'); // 6.45 mm caratFromMm(6.5, 'moissanite'); // 0.94 ct

compareAtWeight(1); // { carat: 1, moissanite_mm: 6.65, diamond_mm: 6.45, cz_mm: 5.49 }

MCP server

Two ways to run it.

Hosted — nothing to install. Point any MCP client at:

https://mcp.fitiny.com/mcp

Listed in the official MCP Registry as com.fitiny/moissanite-tools.

Local — stdio:

node mcp/server.js

Exposes six tools:

Tool	Answers
`carat_to_mm`	How wide is a 1 ct moissanite?
`mm_to_carat`	What does a 6.5 mm stone weigh in each material?
`grading_scale`	What does VVS1 / D colour actually mean?
`ring_size_convert`	What is a UK M in US sizing?
`necklace_length`	Where does an 18" necklace sit?
`stud_appearance`	How big does a 6 mm stud read on the ear?

The maths

GIA's round-brilliant formula, scaled by relative density:

weight_ct = diameter_mm² × depth_mm × 0.0061 × (ρ_stone / ρ_diamond)

depth_mm = diameter_mm × 0.612 (average depth ratio, well-cut round)

Accuracy against published diamond charts: 1.4% mean, 3.3% max. Real stones vary with cut proportions — treat the output as guidance, not as a substitute for weighing a stone.

Round brilliant only. Fancy shapes (oval, princess, emerald, pear) distribute weight differently and need shape-specific factors that aren't in here.

On the data

Colour and clarity scales follow the GIA diamond grading system, which the moissanite trade has adopted. The optical constants (refractive index, dispersion, Mohs hardness, density) are published gemmological values. Nothing here was scraped from another site — the conversion figures are computed from the formula above, which is why they can be released under MIT.

This is a descriptive reference, not a certification. A graded stone comes with a report from a gemmological laboratory; this repo just explains what those grades mean.

Live tool

An interactive version runs at fitiny.com/pages/moissanite-grading.

Licence

MIT — see LICENSE. Maintained by FITINY Jewelry.

Moissanite Tools

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

NexusWindows

README from the maker

moissanite-tools

Why this exists

What's in here

Ring sizes

Usage

MCP server

The maths

On the data

Live tool

Licence