Quartz

Quartz

Quartz comes in more colours than any other gem mineral. Smoky quartz is brown to grey from natural irradiation, rose quartz is pink and nearly always cloudy, and ametrine holds amethyst purple and citrine yellow in one crystal.

  • Smoky quartzSmoky quartz
  • Rose quartzRose quartz
  • AmetrineAmetrine

At a glance

Mineral
Quartz (silicon dioxide)
Refractive index
1.544
Dispersion (C–F)
0.008
Specific gravity
2.65
Mohs hardness
7
Wear
Fine for rings with some care.

Quartz in Jart

The 3 looks in the studio's material library, with the values the renderer uses.

Optics of Quartz in Jart
StoneColourRIDispersion C–FAbbeSGColour depth
Smoky quartz#9a7a5a1.5440.008692.6512 mm
Rose quartz#f2b8c61.5440.008692.658 mm
Ametrine#9a51ce / #ffb43c1.5440.008692.656 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 1.544, a polished quartz facet reflects 4.6% of light that meets it face-on (diamond: 17.2%). Light inside the stone that meets a facet more than 40.4° 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 0.008, 32% of diamond's, which sets how much fire, the flashes of colour, a render shows under small, bright lights.

The rose quartz preset is the cloudiest stone in the studio, a soft translucent glow rather than sharp sparkle. Ametrine is rendered as two colours along the stone, the way cutters orient it.

  • 1 mm
  • 3 mm
  • 6 mm
  • 10 mm
Smoky quartz: the colour of white light after 1, 3, 6 and 10 mm of stone. It takes the full preset colour at 12 mm.
  • 1 mm
  • 3 mm
  • 6 mm
  • 10 mm
Rose quartz: the colour of white light after 1, 3, 6 and 10 mm of stone. It takes the full preset colour at 8 mm.
  • 1 mm
  • 3 mm
  • 6 mm
  • 10 mm
Ametrine: the colour of white light after 1, 3, 6 and 10 mm of stone. It takes the full preset colour at 6 mm.

All gemstones · Metals · Stone and metal pairings · Finishes

Render quartz 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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