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18 renders and diagrams · CC BY 4.0

These pictures are free to use, in Wikipedia or anywhere else, under the Creative Commons Attribution 4.0 license (CC BY 4.0). Credit them to “Digital Gemology (digitalgemology.com)”.

They come from our courses. The stones are computer renders from our ray tracer, not photographs of real stones, and the diagrams are drawn from the same 3D models. Each one has a full-size file.

The pictures

Facet types of a round brilliant with a faceted girdle, 73 facets: the crown seen from above (table, 8 stars, 8 bezels, 16 upper halves), the girdle seen from the side (16 facets) and the pavilion seen from below (8 mains, 16 lower halves). Drawn from a 3D model.
Facet types of a round brilliant with a faceted girdle, 73 facets: the crown seen from above (table, 8 stars, 8 bezels, 16 upper halves), the girdle seen from the side (16 facets) and the pavilion seen from below (8 mains, 16 lower halves). Drawn from a 3D model. Full size (3598 × 1296)
A round brilliant cut diamond seen from the side: 1.00 ct, 6.48 mm across and 4.00 mm deep. Ray-traced render.
A round brilliant cut diamond seen from the side: 1.00 ct, 6.48 mm across and 4.00 mm deep. Ray-traced render. Full size (2321 × 1526)
The zones of a light-return map, by the elevation of the light above the girdle plane: 45° to 75° is direct light (red), below 45° indirect light (green), and 75° and up, where the viewer's head is, contrast (blue). Light lost through the back of the stone is leakage. ASET maps use a similar idea.
The zones of a light-return map, by the elevation of the light above the girdle plane: 45° to 75° is direct light (red), below 45° indirect light (green), and 75° and up, where the viewer's head is, contrast (blue). Light lost through the back of the stone is leakage. ASET maps use a similar idea. Full size (1526 × 1366)
The hearts and arrows pattern of a precisely cut round brilliant diamond in a hearts-and-arrows viewer: eight arrows face up (left) and eight hearts face down (right). Pavilion angle 40.75°, crown angle 34.5°, table 53%. Simulation.
The hearts and arrows pattern of a precisely cut round brilliant diamond in a hearts-and-arrows viewer: eight arrows face up (left) and eight hearts face down (right). Pavilion angle 40.75°, crown angle 34.5°, table 53%. Simulation. Full size (2616 × 1525)
The same diamond with its crown twisted by 1° against the pavilion. The arrows (symmetry 92%) and the hearts (symmetry 88%) no longer line up. Simulation.
The same diamond with its crown twisted by 1° against the pavilion. The arrows (symmetry 92%) and the hearts (symmetry 88%) no longer line up. Simulation. Full size (2616 × 1525)
Six diamond cuts from the history of the brilliant, each 1.00 ct, face up: old single, Mazarin, Peruzzi (top), old mine, old European and a modern round brilliant (bottom). Ray-traced renders.
Six diamond cuts from the history of the brilliant, each 1.00 ct, face up: old single, Mazarin, Peruzzi (top), old mine, old European and a modern round brilliant (bottom). Ray-traced renders. Full size (3499 × 1530)
A Mazarin cut (left, with its large open culet) and a modern round brilliant (right), both 1.00 ct diamonds, face up. Ray-traced render.
A Mazarin cut (left, with its large open culet) and a modern round brilliant (right), both 1.00 ct diamonds, face up. Ray-traced render. Full size (3184 × 1502)
A modern round brilliant (left) and a Peruzzi cut (right), both 1.00 ct diamonds, face up. Ray-traced render.
A modern round brilliant (left) and a Peruzzi cut (right), both 1.00 ct diamonds, face up. Ray-traced render. Full size (3197 × 1502)
A Peruzzi cut (left) and an old mine cut (right), both 1.00 ct diamonds, face up. Ray-traced render.
A Peruzzi cut (left) and an old mine cut (right), both 1.00 ct diamonds, face up. Ray-traced render. Full size (3200 × 1502)
The same 1.00 ct round brilliant diamond at color grades D, H, N and Z, face up. Ray-traced render.
The same 1.00 ct round brilliant diamond at color grades D, H, N and Z, face up. Ray-traced render. Full size (3677 × 1264)
The same 1.00 ct round brilliant diamond at clarity grades FL, SI2 and I3, face up, with simulated inclusions. Ray-traced render.
The same 1.00 ct round brilliant diamond at clarity grades FL, SI2 and I3, face up, with simulated inclusions. Ray-traced render. Full size (3646 × 1405)
Two diamonds under ultraviolet light: no fluorescence (left) and very strong blue fluorescence (right). Ray-traced render.
Two diamonds under ultraviolet light: no fluorescence (left) and very strong blue fluorescence (right). Ray-traced render. Full size (3171 × 1502)
Light-return maps of one round brilliant design at Excellent, Good and Poor cut grades: red is direct light, green indirect light, blue contrast and black leakage. Ray-traced.
Light-return maps of one round brilliant design at Excellent, Good and Poor cut grades: red is direct light, green indirect light, blue contrast and black leakage. Ray-traced. Full size (3610 × 1530)
Light-return maps of 1.00 ct diamonds: a round brilliant, an oval, a pear and a marquise. The oval and the pear lose more light across the middle, where a dark bow-tie shows. Red direct, green indirect, blue contrast, black leakage. Ray-traced.
Light-return maps of 1.00 ct diamonds: a round brilliant, an oval, a pear and a marquise. The oval and the pear lose more light across the middle, where a dark bow-tie shows. Red direct, green indirect, blue contrast, black leakage. Ray-traced. Full size (3719 × 1530)
A diamond (left) and a moissanite (right) seen at an angle. Moissanite is doubly refractive, so the edges of its back facets look doubled; diamond is singly refractive and shows no doubling. Ray-traced render.
A diamond (left) and a moissanite (right) seen at an angle. Moissanite is doubly refractive, so the edges of its back facets look doubled; diamond is singly refractive and shows no doubling. Ray-traced render. Full size (3586 × 1468)
One carat of diamond (6.5 mm across), moissanite (6.7 mm) and cubic zirconia (5.5 mm) in the same round brilliant cut, face up. Moissanite is lighter and cubic zirconia heavier than diamond for the same size. Ray-traced render.
One carat of diamond (6.5 mm across), moissanite (6.7 mm) and cubic zirconia (5.5 mm) in the same round brilliant cut, face up. Moissanite is lighter and cubic zirconia heavier than diamond for the same size. Ray-traced render. Full size (3568 × 1393)
The interference figure of moissanite seen down its optic axis between crossed polarizers, with a first-order red plate: a uniaxial figure, optically positive. Simulation.
The interference figure of moissanite seen down its optic axis between crossed polarizers, with a first-order red plate: a uniaxial figure, optically positive. Simulation. Full size (1227 × 1452)
Unit cells of diamond (carbon, diamond cubic structure) and moissanite (silicon carbide, hexagonal, 6H stacking). Ball-and-stick drawing.
Unit cells of diamond (carbon, diamond cubic structure) and moissanite (silicon carbide, hexagonal, 6H stacking). Ball-and-stick drawing. Full size (2688 × 1481)

How to credit them

Write “Digital Gemology (digitalgemology.com), CC BY 4.0” next to the picture or in your list of sources, with a link to digitalgemology.com/about/free-images where you can. You may crop, resize or translate the labels. Say if you changed a picture. The license covers these pictures only, not our 3D models or cutting files.