Garnet

Garnet

Garnet is a family of minerals rather than one. The deep red stones are mostly pyrope and almandine; rhodolite is their raspberry to purplish-red blend.

  • GarnetGarnet
  • Rhodolite garnetRhodolite garnet

At a glance

Mineral
Garnet group; rhodolite is pyrope–almandine
Refractive index
1.76
Dispersion (C–F)
0.014
Specific gravity
3.90
Mohs hardness
6.5–7.5
Wear
Good for most jewellery; no cleavage, so it resists chipping better than its hardness suggests.

Garnet in Jart

The 2 looks in the studio's material library, with the values the renderer uses.

Optics of Garnet in Jart
StoneColourRIDispersion C–FAbbeSGColour depth
Garnet#a3182e1.760.014543.905.2 mm
Rhodolite garnet#c23a741.760.014543.848 mm

RI refractive index (nd). Dispersion C–F nF − nC, 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.

How it renders

With a refractive index of 1.76, a polished garnet facet reflects 7.6% of light that meets it face-on (diamond: 17.2%). Light inside the stone that meets a facet more than 34.6° from straight on cannot leave and is reflected back in; the smaller that angle, the more light a good cut returns to the eye (diamond 24.4°, quartz 40.4°).

Its dispersion (C–F) is 0.014, 57% of diamond's, which sets how much fire, the flashes of colour, a render shows under small, bright lights.

Garnet has a high refractive index and more fire than sapphire, but deep red garnet absorbs light quickly, so large stones turn dark. Rhodolite stays brighter over the same depth.

  • 1 mm
  • 3 mm
  • 6 mm
  • 10 mm
Garnet: the colour of white light after 1, 3, 6 and 10 mm of stone. It takes the full preset colour at 5.2 mm.
  • 1 mm
  • 3 mm
  • 6 mm
  • 10 mm
Rhodolite garnet: the colour of white light after 1, 3, 6 and 10 mm of stone. It takes the full preset colour at 8 mm.

All gemstones · Metals · Stone and metal pairings · Finishes

Render garnet 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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