Gemstone and diamond cuts: ray-traced brilliance, fire and sparkle in 7 gems, 3D and faceting files
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best_cuts_for_gemstone Read-only
The top ten brilliants and the top ten jewelry cuts in one gemstone, ranked by brilliance, fire and scintillation added together, with the stone's optical constants.
Gemstone, as its slug.
brilliants (round cuts), jewelry (fancy and step shapes) or both.
Install
Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.
claude mcp add --transport http cut-library https://digitalgemology.com/mcp
Tools (8)
Tool list last changed Oct 31, 2026.
best_cuts_for_gemstoneThe top ten brilliants and the top ten jewelry cuts in one gemstone, ranked by brilliance, fire and scintillation added together, with the stone's optical constants.
read-only
The top ten brilliants and the top ten jewelry cuts in one gemstone, ranked by brilliance, fire and scintillation added together, with the stone's optical constants.
| Argument | Type | Description |
|---|---|---|
| kind | string | brilliants (round cuts), jewelry (fancy and step shapes) or both. |
| gemstone* | string | Gemstone, as its slug. |
Input schema (JSON)
{
"type": "object",
"required": [
"gemstone"
],
"properties": {
"kind": {
"enum": [
"brilliants",
"jewelry",
"both"
],
"type": "string",
"default": "both",
"description": "brilliants (round cuts), jewelry (fancy and step shapes) or both."
},
"gemstone": {
"enum": [
"diamond",
"moissanite",
"cubic-zirconia",
"ruby",
"sapphire",
"emerald",
"amethyst"
],
"type": "string",
"description": "Gemstone, as its slug."
}
},
"additionalProperties": false
}compare_cutsTwo cuts side by side in one gemstone: overall, brilliance, fire, scintillation, tilt, face-up spread and leakage from the Cut Performance Index, each cut's place in that stone, facets and size, and the products with prices and checkout links. For questions like 'oval or pear for my sapphire?'.
read-only
Two cuts side by side in one gemstone: overall, brilliance, fire, scintillation, tilt, face-up spread and leakage from the Cut Performance Index, each cut's place in that stone, facets and size, and the products with prices and checkout links. For questions like 'oval or pear for my sapphire?'.
| Argument | Type | Description |
|---|---|---|
| cut_a* | string | The first cut's slug or name, for example 'oval'. |
| cut_b* | string | The second cut's slug or name, for example 'pear'. |
| gemstone | string | The stone to compare them in; diamond if left out. |
Input schema (JSON)
{
"type": "object",
"required": [
"cut_a",
"cut_b"
],
"properties": {
"cut_a": {
"type": "string",
"description": "The first cut's slug or name, for example 'oval'."
},
"cut_b": {
"type": "string",
"description": "The second cut's slug or name, for example 'pear'."
},
"gemstone": {
"enum": [
"diamond",
"moissanite",
"cubic-zirconia",
"ruby",
"sapphire",
"emerald",
"amethyst"
],
"type": "string",
"description": "The stone to compare them in; diamond if left out."
}
},
"additionalProperties": false
}cut_in_gemstoneHow one cut performs in one gemstone: its headline, eight measured scores against the T73 round brilliant in the same stone, and its pros and cons. For questions like 'is an oval a good cut for sapphire?'.
read-only
How one cut performs in one gemstone: its headline, eight measured scores against the T73 round brilliant in the same stone, and its pros and cons. For questions like 'is an oval a good cut for sapphire?'.
| Argument | Type | Description |
|---|---|---|
| cut* | string | The cut's slug or name. |
| gemstone* | string | Gemstone, as its slug. |
Input schema (JSON)
{
"type": "object",
"required": [
"cut",
"gemstone"
],
"properties": {
"cut": {
"type": "string",
"description": "The cut's slug or name."
},
"gemstone": {
"enum": [
"diamond",
"moissanite",
"cubic-zirconia",
"ruby",
"sapphire",
"emerald",
"amethyst"
],
"type": "string",
"description": "Gemstone, as its slug."
}
},
"additionalProperties": false
}get_cutEverything about one cut: what it is, measured specifications (facets, angles, depth, size, index gear), brilliance, fire and scintillation in all seven gemstones against the T73, the products with prices and checkout links, its questions and answers, and its page.
read-only
Everything about one cut: what it is, measured specifications (facets, angles, depth, size, index gear), brilliance, fire and scintillation in all seven gemstones against the T73, the products with prices and checkout links, its questions and answers, and its page.
| Argument | Type | Description |
|---|---|---|
| cut* | string | The cut's slug or name, for example 'asscher', 'T73' or 'Old European'. |
| gemstone | string | Optional: also return the pros and cons of this cut in this stone. |
Input schema (JSON)
{
"type": "object",
"required": [
"cut"
],
"properties": {
"cut": {
"type": "string",
"description": "The cut's slug or name, for example 'asscher', 'T73' or 'Old European'."
},
"gemstone": {
"enum": [
"diamond",
"moissanite",
"cubic-zirconia",
"ruby",
"sapphire",
"emerald",
"amethyst"
],
"type": "string",
"description": "Optional: also return the pros and cons of this cut in this stone."
}
},
"additionalProperties": false
}get_cut_scoresScores from the Digital Gemology Cut Performance Index for every cut we sell: overall, brilliance, fire, scintillation, tilt, symmetry, spread, shape-norm and leakage, ray traced separately in diamond, moissanite, cubic zirconia, ruby, sapphire, emerald and amethyst, with each cut's place in its material. Filter by cut, category or material; with no filter, every row. Figures are unrounded. Never compare or rank scores across materials. Ruby and sapphire share one refractive index, so the same figures. Cuts not yet scored come with the reason.
read-only
Scores from the Digital Gemology Cut Performance Index for every cut we sell: overall, brilliance, fire, scintillation, tilt, symmetry, spread, shape-norm and leakage, ray traced separately in diamond, moissanite, cubic zirconia, ruby, sapphire, emerald and amethyst, with each cut's place in its material. Filter by cut, category or material; with no filter, every row. Figures are unrounded. Never compare or rank scores across materials. Ruby and sapphire share one refractive index, so the same figures. Cuts not yet scored come with the reason.
| Argument | Type | Description |
|---|---|---|
| cut | string | The cut's slug or name, for example 'oval' or 'DG-M5'. |
| category | string | brilliants, jewelry, historic, house or platonic. |
| material | string | One stone (diamond, moissanite, cubic-zirconia, ruby, sapphire, emerald or amethyst); leave it out for all seven. |
Input schema (JSON)
{
"type": "object",
"properties": {
"cut": {
"type": "string",
"description": "The cut's slug or name, for example 'oval' or 'DG-M5'."
},
"category": {
"enum": [
"brilliants",
"jewelry",
"historic",
"house",
"platonic"
],
"type": "string",
"description": "brilliants, jewelry, historic, house or platonic."
},
"material": {
"enum": [
"diamond",
"moissanite",
"cubic-zirconia",
"ruby",
"sapphire",
"emerald",
"amethyst"
],
"type": "string",
"description": "One stone (diamond, moissanite, cubic-zirconia, ruby, sapphire, emerald or amethyst); leave it out for all seven."
}
},
"additionalProperties": false
}list_gemstonesThe seven gemstones every cut is measured in, with refractive index, critical angle, dispersion, hardness and specific gravity, and the three best cuts of each kind.
read-only
The seven gemstones every cut is measured in, with refractive index, critical angle, dispersion, hardness and specific gravity, and the three best cuts of each kind.
No arguments.
Input schema (JSON)
{
"type": "object",
"properties": {},
"additionalProperties": false
}recommend_cutThe best cuts in one gemstone for what matters to the buyer: overall light performance, brilliance, fire, scintillation (sparkle), spread (looks bigger for its weight), tilt (stays bright when tilted) or leakage (least light lost). Filter by family or outline. Returns a ranked short list with each cut's page and checkout links.
read-only
The best cuts in one gemstone for what matters to the buyer: overall light performance, brilliance, fire, scintillation (sparkle), spread (looks bigger for its weight), tilt (stays bright when tilted) or leakage (least light lost). Filter by family or outline. Returns a ranked short list with each cut's page and checkout links.
| Argument | Type | Description |
|---|---|---|
| limit | integer | How many cuts to return, 1 to 20; 5 if left out. |
| shape | string | Only cuts with this outline. All if left out. |
| category | string | Only this family: brilliants, jewelry, historic or house. All if left out. |
| gemstone* | string | Gemstone, as its slug. |
| priority | string | What to rank by; leakage ranks the least light lost first. overall if left out. |
Input schema (JSON)
{
"type": "object",
"required": [
"gemstone"
],
"properties": {
"limit": {
"type": "integer",
"default": 5,
"maximum": 20,
"minimum": 1,
"description": "How many cuts to return, 1 to 20; 5 if left out."
},
"shape": {
"enum": [
"round",
"elongated",
"square",
"triangular",
"other"
],
"type": "string",
"description": "Only cuts with this outline. All if left out."
},
"category": {
"enum": [
"brilliants",
"jewelry",
"historic",
"house"
],
"type": "string",
"description": "Only this family: brilliants, jewelry, historic or house. All if left out."
},
"gemstone": {
"enum": [
"diamond",
"moissanite",
"cubic-zirconia",
"ruby",
"sapphire",
"emerald",
"amethyst"
],
"type": "string",
"description": "Gemstone, as its slug."
},
"priority": {
"enum": [
"overall",
"brilliance",
"fire",
"scintillation",
"spread",
"tilt",
"leakage"
],
"type": "string",
"default": "overall",
"description": "What to rank by; leakage ranks the least light lost first. overall if left out."
}
},
"additionalProperties": false
}search_cutsSearch Digital Gemology's gem cuts and Platonic solids by name, style, shape or use (for example 'square step cut', 'round brilliant for moissanite', 'historic cushion', 'pear'). Returns each match with its page, facets, size, price and checkout links. Give a gemstone to add the cut's brilliance, fire and scintillation in that stone and to sort by them.
read-only
Search Digital Gemology's gem cuts and Platonic solids by name, style, shape or use (for example 'square step cut', 'round brilliant for moissanite', 'historic cushion', 'pear'). Returns each match with its page, facets, size, price and checkout links. Give a gemstone to add the cut's brilliance, fire and scintillation in that stone and to sort by them.
| Argument | Type | Description |
|---|---|---|
| sort | string | relevance (default with a query), total (brilliance + fire + scintillation, the default with a gemstone and no query), brilliance, fire, scintillation, facets (most first) or name. |
| limit | integer | How many cuts to return, 1 to 50; 10 if left out. |
| query | string | Free text. Leave it out to list every cut that fits the filters. |
| shape | string | Outline of the cut. |
| category | string | brilliants, jewelry (fancy and step cuts), historic, house (our own designs) or platonic (solids, 3D files only). |
| gemstone | string | Gemstone, as its slug. |
| cutting_files | boolean | Only cuts that are also sold as GemCad cutting files. |
Input schema (JSON)
{
"type": "object",
"properties": {
"sort": {
"enum": [
"relevance",
"total",
"brilliance",
"fire",
"scintillation",
"facets",
"name"
],
"type": "string",
"description": "relevance (default with a query), total (brilliance + fire + scintillation, the default with a gemstone and no query), brilliance, fire, scintillation, facets (most first) or name."
},
"limit": {
"type": "integer",
"default": 10,
"maximum": 50,
"minimum": 1,
"description": "How many cuts to return, 1 to 50; 10 if left out."
},
"query": {
"type": "string",
"description": "Free text. Leave it out to list every cut that fits the filters."
},
"shape": {
"enum": [
"round",
"elongated",
"square",
"triangular",
"other",
"solid"
],
"type": "string",
"description": "Outline of the cut."
},
"category": {
"enum": [
"brilliants",
"jewelry",
"historic",
"house",
"platonic"
],
"type": "string",
"description": "brilliants, jewelry (fancy and step cuts), historic, house (our own designs) or platonic (solids, 3D files only)."
},
"gemstone": {
"enum": [
"diamond",
"moissanite",
"cubic-zirconia",
"ruby",
"sapphire",
"emerald",
"amethyst"
],
"type": "string",
"description": "Gemstone, as its slug."
},
"cutting_files": {
"type": "boolean",
"description": "Only cuts that are also sold as GemCad cutting files."
}
},
"additionalProperties": false
}Security checkA100/100
We read every tool's name, description and inputs the way the model will, looking for instructions hidden from you. A clean result means no warning signs, not a guarantee. Scanned Oct 31, 2026.
- Hidden or reordered text
- Overriding the model's instructions
- Hiding actions from the user
- Reading keys or credentials
- Fake system tags
- Steering other servers' tools
- Pulling in the conversation
- Smuggling parameters
- Demanding to be used for everything
- Steering away from web search
- Download-and-run commands
- Encoded blobs
- Invisible characters
- Credentials as tool arguments
- Very long descriptions
- Read and write hints
Tool changes
What changed in this server's tools since we started watching, newest first. Each change is scanned again.
recommend_cutaddedOct 31, 2026
The best cuts in one gemstone for what matters to the buyer: overall light performance, brilliance, fire, scintillation (sparkle), spread (looks bigger for its weight), tilt (stays bright when tilted) or leakage (least light lost). Filter by family or outline. Returns a ranked short list with each cut's page and checkout links.
compare_cutsaddedOct 31, 2026
Two cuts side by side in one gemstone: overall, brilliance, fire, scintillation, tilt, face-up spread and leakage from the Cut Performance Index, each cut's place in that stone, facets and size, and the products with prices and checkout links. For questions like 'oval or pear for my sapphire?'.
search_cutschanged (inputs)Oct 31, 2026
{ "type": "object", "properties": { "sort": { "enum": [ "relevance", "total", "brilliance", "fire", "scintillation", "facets", "name" ], "type": "string", "description": "relevance (default with a query), total (brilliance + fire + scintillation, the default with a gemstone and no query), brilliance, fire, scintillation, facets (most first) or name." }, "limit": { "type": "integer", "default": 10, "maximum": 50, "minimum": 1 }, "query": { "type": "string", "description": "Free text. Leave it out to list every cut that fits the filters." }, "shape": { "enum": [ "round", "elongated", "square", "triangular", "other", "solid" ], "type": "string", "description": "Outline of the cut." }, "category": { "enum": [ "brilliants", "jewelry", "historic", "house", "platonic" ], "type": "string", "description": "brilliants, jewelry (fancy and step cuts), historic, house (our own designs) or platonic (solids, 3D files only)." }, "gemstone": { "enum": [ "diamond", "moissanite", "cubic-zirconia", "ruby", "sapphire", "emerald", "amethyst" ], "type": "string", "description": "Gemstone, as its slug." }, "cutting_files": { "type": "boolean", "description": "Only cuts that are also sold as GemCad cutting files." } }, "additionalProperties": false }{ "type": "object", "properties": { "sort": { "enum": [ "relevance", "total", "brilliance", "fire", "scintillation", "facets", "name" ], "type": "string", "description": "relevance (default with a query), total (brilliance + fire + scintillation, the default with a gemstone and no query), brilliance, fire, scintillation, facets (most first) or name." }, "limit": { "type": "integer", "default": 10, "maximum": 50, "minimum": 1, "description": "How many cuts to return, 1 to 50; 10 if left out." }, "query": { "type": "string", "description": "Free text. Leave it out to list every cut that fits the filters." }, "shape": { "enum": [ "round", "elongated", "square", "triangular", "other", "solid" ], "type": "string", "description": "Outline of the cut." }, "category": { "enum": [ "brilliants", "jewelry", "historic", "house", "platonic" ], "type": "string", "description": "brilliants, jewelry (fancy and step cuts), historic, house (our own designs) or platonic (solids, 3D files only)." }, "gemstone": { "enum": [ "diamond", "moissanite", "cubic-zirconia", "ruby", "sapphire", "emerald", "amethyst" ], "type": "string", "description": "Gemstone, as its slug." }, "cutting_files": { "type": "boolean", "description": "Only cuts that are also sold as GemCad cutting files." } }, "additionalProperties": false }get_cut_scoreschanged (description, inputs)Oct 31, 2026
Scores from the Digital Gemology Cut Performance Index for every cut we sell: overall, brilliance, fire, scintillation, tilt, symmetry, spread, shape-norm and leakage, ray traced separately in
diamonddiamond,andmoissanite,incubicmoissanite,zirconia, ruby, sapphire, emerald and amethyst, with each cut's place in its material. Filter by cut, category or material; with no filter, every row. Figures are unrounded. Never compare or rank scores across materials. Ruby and sapphire share one refractive index, so the same figures. Cuts not yet scored come with the reason.{ "type": "object", "properties": { "cut": { "type": "string", "description": "The cut's slug or name, for example 'oval' or 'DG-M5'." }, "category": { "enum": [ "brilliants", "jewelry", "historic", "house", "platonic" ], "type": "string", "description": "brilliants, jewelry, historic, house or platonic." }, "material": { "enum": [ "diamond", "moissanite" ], "type": "string", "description": "diamond or moissanite; leave it out for both." } }, "additionalProperties": false }{ "type": "object", "properties": { "cut": { "type": "string", "description": "The cut's slug or name, for example 'oval' or 'DG-M5'." }, "category": { "enum": [ "brilliants", "jewelry", "historic", "house", "platonic" ], "type": "string", "description": "brilliants, jewelry, historic, house or platonic." }, "material": { "enum": [ "diamond", "moissanite", "cubic-zirconia", "ruby", "sapphire", "emerald", "amethyst" ], "type": "string", "description": "One stone (diamond, moissanite, cubic-zirconia, ruby, sapphire, emerald or amethyst); leave it out for all seven." } }, "additionalProperties": false }