Digital Gemology cut library bronze

Search the cut library

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 and price; get_cut gives the checkout links. Give a gemstone to add the cut's brilliance, fire and scintillation in that stone and to sort by them.

• Find a square step cut
• Round brilliant cuts for moissanite
• Historic cushion cuts as 3D models

Get one cut

Everything about one cut: what it is, measured specifications (facets, angles, depth, size, index gear), brilliance, fire and scintillation in all 26 gemstones against the T73, the products with prices and checkout links, its questions and answers, and its page.

• Tell me about the Asscher cut
• Price and files of DG-Anteros

Best cuts for a gemstone

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.

• Best cuts for sapphire
• Top jewelry cuts in emerald

One cut in one gemstone

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?'.

• Is an oval a good cut for ruby?
• Asscher cut in sapphire

List the gemstones

The 30 gemstones we score cuts in, with refractive index, critical angle, dispersion, hardness and specific gravity, and the three best cuts of each kind. An alias stone names the stone whose figures it shows (cut_scores_from).

• Which gemstones do you measure?
• Critical angle of amethyst

Cut Performance Index scores

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 26 gemstones (diamond, moissanite, cubic zirconia, ruby, sapphire, emerald, amethyst, topaz, spinel, demantoid, zircon, tourmaline, peridot, tanzanite, YAG, pyrope, almandine, spessartine, grossular, chrysoberyl, kunzite, iolite, morganite, GGG, strontium titanate and synthetic rutile), 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; material_notes lists the other stones that share figures and the doubling caveats. Cuts not yet scored come with the reason.

• {"skill": "get_cut_scores", "arguments": {"material": "sapphire"}}
• {"skill": "get_cut_scores", "arguments": {"cut": "oval"}}

Compare two cuts

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?'.

• {"skill": "compare_cuts", "arguments": {"cut_a": "oval", "cut_b": "pear", "gemstone": "sapphire"}}

Recommend a cut

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.

• {"skill": "recommend_cut", "arguments": {"gemstone": "moissanite", "priority": "fire"}}

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