Gemstones

Every stone, with the numbers behind its light.

Refractive index, dispersion, specific gravity and colour for the 51 gemstones in Jart's material library, grouped into 23 stones. These are the values the renderer uses, so a render shows the brilliance and fire the numbers predict.

Diamond
Ruby
Sapphire
Emerald
Tanzanite
Morganite

The stones

Each page lists the looks the studio has for that stone, how it renders and how it wears. Which metal suits which stone: eight pairings, rendered.

Refractive index and dispersion chart

All 51 looks. Opaque stones show no dispersion: light does not travel through them.

Optics of every gemstone in Jart
Stone	Colour	RI	Dispersion C–F	Abbe	SG	Colour depth
Diamond	#ffffff	2.417	0.025	57	3.52	70 mm
Diamond H	#fff4dc	2.417	0.025	57	3.52	45 mm
Diamond K	#ffeabd	2.417	0.025	57	3.52	32 mm
Diamond P	#ffe199	2.417	0.025	57	3.52	24 mm
Diamond T	#ffd877	2.417	0.025	57	3.52	18 mm
Yellow diamond	#ffcc1f	2.417	0.025	57	3.52	7.7 mm
Champagne diamond	#e2b98a	2.417	0.025	57	3.52	12 mm
Cognac diamond	#c07b3d	2.417	0.025	57	3.52	7 mm
Pink diamond	#f5a3c0	2.417	0.025	57	3.52	13.8 mm
Blue diamond	#8db7ff	2.417	0.025	57	3.52	13.8 mm
Green diamond	#a5e0ad	2.417	0.025	57	3.52	13.8 mm
Black diamond	#2a2a2e	2.417	0.025	57	3.52	0.34 mm
Ruby	#d91c44	1.77	0.011	69	4.00	4.3 mm
Natural ruby	#d91c44	1.77	0.011	69	4.00	5 mm
Sapphire	#234fde	1.77	0.011	69	4.00	3.9 mm
Natural sapphire	#2f5ad8	1.77	0.011	69	4.00	5 mm
Yellow sapphire	#ffc22e	1.77	0.011	69	4.00	5 mm
Natural yellow sapphire	#ffc22e	1.77	0.011	69	4.00	6 mm
Pink sapphire	#f2559a	1.77	0.011	69	4.00	5 mm
Green sapphire	#3aa884	1.77	0.011	69	4.00	8 mm
Emerald	#16a76d	1.58	0.009	65	2.72	4.3 mm
Natural emerald	#16a76d	1.58	0.009	65	2.72	5 mm
Aquamarine	#6cd9ed	1.58	0.009	65	2.72	7.7 mm
Morganite	#f3ab9f	1.58	0.009	65	2.72	10.3 mm
Amethyst	#9a51ce	1.55	0.008	69	2.65	5.2 mm
Citrine	#ffbd4c	1.55	0.008	69	2.65	6 mm
Smoky quartz	#9a7a5a	1.544	0.008	69	2.65	12 mm
Rose quartz	#f2b8c6	1.544	0.008	69	2.65	8 mm
Ametrine	#9a51ce / #ffb43c	1.544	0.008	69	2.65	6 mm
Tanzanite	#7f5ee6	1.694	0.012	57	3.35	6 mm
Peridot	#9bd23c	1.67	0.012	56	3.34	6 mm
Blue topaz	#4aa8e8	1.62	0.008	77	3.53	6.9 mm
London blue topaz	#3a6c9c	1.62	0.008	77	3.53	8 mm
Garnet	#a3182e	1.76	0.014	54	3.90	5.2 mm
Rhodolite garnet	#c23a74	1.76	0.014	54	3.84	8 mm
Alexandrite	#3f9c86	1.746	0.009	83	3.73	9 mm
Green tourmaline	#3a9a62	1.624	0.009	69	3.06	9 mm
Pink tourmaline	#e2488a	1.624	0.009	69	3.06	5.5 mm
Bi-colour tourmaline	#e2488a / #3a9a62	1.624	0.009	69	3.06	6 mm
Watermelon tourmaline	#e2488a / #2f9a5a	1.624	0.009	69	3.06	6 mm
Blue zircon	#3cb4d8	1.93	0.022	43	4.65	6 mm
Red zircon	#d23c48	1.93	0.022	43	4.65	8 mm
Yellow zircon	#f0b43a	1.93	0.022	43	4.65	6 mm
Onyx	#141416	1.544	0.008	69	2.65	0.26 mm
Blue lace agate	#8fa3b8	1.544	—	—	2.65	opaque
Banded agate	#b06a3a	1.544	—	—	2.65	opaque
Red jasper	#9c2f24	1.54	—	—	2.65	opaque
Malachite	#1f8a5a	1.85	—	—	3.90	opaque
Lapis lazuli	#1d3b9a	1.50	—	—	2.80	opaque
Turquoise	#3fb8b0	1.61	—	—	2.70	opaque
Jade	#3f8f5c	1.66	—	—	3.30	opaque

RI refractive index (n_d). Dispersion C–F n_F − n_C, the spread between blue and red light; many gem tables quote the B–G figure instead (diamond 0.044, here 0.025). Abbe number: lower means more fire. SG specific gravity, used for carat estimates in Design Facts. Colour depth the path through the stone after which white light takes the stone's full colour; shorter paths look paler.

Render these stones on your own design.

Open a 3DM, STL or GLB file, or a sample ring, choose the stone and the metal, and render it photoreal in your browser. No account needed.

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