FITINY jewellery tools: density-corrected carat/mm, GIA grades, ISO 8653 ring sizes
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Diameter in millimetres for a given carat weight. Round brilliant cut. Density-corrected per stone - a diamond chart is wrong for moissanite by ~9%.
Carat weight, e.g. 1.0
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Diameter in millimetres for a given carat weight. Round brilliant cut. Density-corrected per stone - a diamond chart is wrong for moissanite by ~9%.
| Argument | Type | Description |
|---|---|---|
| carat* | number | Carat weight, e.g. 1.0 |
| stone | string |
{
"type": "object",
"required": [
"carat"
],
"properties": {
"carat": {
"type": "number",
"description": "Carat weight, e.g. 1.0"
},
"stone": {
"enum": [
"moissanite",
"diamond",
"cz"
],
"type": "string",
"default": "moissanite"
}
}
}GIA colour (D-K) or clarity (FL-SI) scale as used for moissanite, or published optical constants for moissanite / diamond / cubic zirconia.
| Argument | Type | Description |
|---|---|---|
| grade | string | Optional single grade, e.g. "D" or "VVS1" |
| scale* | string |
{
"type": "object",
"required": [
"scale"
],
"properties": {
"grade": {
"type": "string",
"description": "Optional single grade, e.g. \"D\" or \"VVS1\""
},
"scale": {
"enum": [
"colour",
"clarity",
"optical"
],
"type": "string"
}
}
}Carat weight for a given diameter in millimetres. Round brilliant cut.
| Argument | Type | Description |
|---|---|---|
| mm* | number | Diameter in mm, e.g. 6.5 |
| stone | string |
{
"type": "object",
"required": [
"mm"
],
"properties": {
"mm": {
"type": "number",
"description": "Diameter in mm, e.g. 6.5"
},
"stone": {
"enum": [
"moissanite",
"diamond",
"cz"
],
"type": "string",
"default": "moissanite"
}
}
}Where a necklace of a given length sits, with the trade name (choker, princess, matinee...).
| Argument | Type | Description |
|---|---|---|
| unit | string | |
| value* | number |
{
"type": "object",
"required": [
"value"
],
"properties": {
"unit": {
"enum": [
"inches",
"cm"
],
"type": "string",
"default": "inches"
},
"value": {
"type": "number"
}
}
}Convert a ring size between US, UK, EU (ISO 8653) and inner diameter in mm. A US 6 is a UK M, not a UK 6.
| Argument | Type | Description |
|---|---|---|
| from | string | |
| value* | any | Size in the source system, e.g. 7 or "M" |
{
"type": "object",
"required": [
"value"
],
"properties": {
"from": {
"enum": [
"us",
"uk",
"eu",
"mm"
],
"type": "string",
"default": "us"
},
"value": {
"description": "Size in the source system, e.g. 7 or \"M\""
}
}
}How a round stud of a given stone diameter reads on the ear.
| Argument | Type | Description |
|---|---|---|
| diameter_mm* | number |
{
"type": "object",
"required": [
"diameter_mm"
],
"properties": {
"diameter_mm": {
"type": "number"
}
}
}