Gem library
Rose quartz
The stone of tenderness
Rose quartz is the heart stone par excellence in tradition, and one of the most widespread minerals on Earth. Its pastel tint comes not from a pigment but from microscopic mineral fibres included in the silica, invisible to the naked eye.
- Hardness (Mohs)
- 7
- Density
- 2.65
- Crystal system
- Trigonal
- Refractive index
- 1.544 – 1.553
- Cleavage
- None
Mineralogical identity
- Family
- Quartz — silica group
- Species
- Quartz
- Variety
- Rose quartz
- Chemical formula
- SiO₂
- Crystal system
- Trigonal (rhombohedral)
- Classification
- Semi-precious stone
- Rarity
- Very common
- Indicative price
- €0.50 – 8/ct
Etymology
Quartz probably derives from the Saxon querklufterz, «ore of cross veins»; the qualifier rose is purely descriptive.
Physical & optical properties
- Hardness (Mohs)
- 7
- Density
- 2.65
- Refractive index
- 1.544 – 1.553
- Birefringence
- 0.009
- Cleavage
- None
- Fracture
- Conchoidal
- Lustre
- Vitreous to waxy
- Diaphaneity
- Translucent, rarely transparent
- UV fluorescence
- None
- Pleochroism
- None
- Colours
- pink, pale pink
Formation, geology & history
The riddle of its colour
For decades the pink of quartz was attributed to manganese or titanium. Work carried out in the 2000s settled the question: the colour comes from nanofibres of a mineral close to dumortierite, dispersed through the crystal. Only a few nanometres wide, these fibres scatter light and give rose quartz its milky look — it is never perfectly transparent. That is also why it almost always occurs in compact masses rather than fine crystals: the fibres prevent orderly growth. True crystallised rose quartz, in small pale pink prisms, is a rare and distinct collector's mineral.
Formation and deposits
It forms in pegmatites, those pockets of residual magma where crystals reach spectacular sizes, and is quarried in massive blocks of several hundred kilos. Madagascar yields the deepest tones, almost raspberry; Brazil supplies enormous volumes of pale pink, mostly cut into spheres, hearts and polished pebbles. One particular variety, star rose quartz, contains aligned rutile needles that produce a six-rayed star under a point light source — visible mainly on spheres and thick cabochons.
The rose quartz market
This is one of the cheapest stones in the trade, which makes it the gateway to thousands of collections. Beware of two practices, however: blocks dyed artificially to intensify the pink (colour too bright, concentrated in the cracks), and pink glass sold as beads. Gem-quality rose quartz, transparent enough to facet, does exist but stays discreet on the market; most production goes into cabochons, beads and decorative objects.
How to recognise it
- Naturally milky lookA perfectly transparent rose quartz is suspect: scattering by the nanofibres always creates a soft veil. A clear, vivid pink is probably glass.
- Coolness and weightDense (2.65) and cool to the touch, unlike resin, which is light and warm. Compare two beads of the same size in your hand.
- Colour throughout the massRose quartz is evenly coloured in depth. A dyed stone shows brighter pink in cracks and pores.
Imitations, treatments & confusions
- Pink glassBubbles under the loupe, an over-clear look, moulding seams on beads. Glass warms instantly in the hand.
- Dyed white quartzCommon in cheap beads: the dye concentrates in microfractures and pales in hot soapy water. Rub discreetly with damp cotton.
- Resin and plasticVery light, scratched by a fingernail or knife, dull-sounding when knocked together. Quartz gives a clear ring.
Deposits & origins
Madagascar (the most intense, known as Madagascar pink), Brazil (Minas Gerais), South Africa, Namibia, India, United States (South Dakota); the rare crystallised rose quartz comes from Brazil (Rio Grande do Norte)
Care & precautions
- Warm soapy water without restriction: one of the most tolerant stones there is.
- Sunlight fades it: avoid prolonged exposure in a sunny display case.
- The polish dulls over time on handled pebbles; a light repolish with fine paste revives it.
- With no cleavage and no particular fragility, it tolerates ultrasonic cleaning well.
Traditions & crystal healing
- Chakras
- Heart
- Zodiac signs
- Taurus · Libra · Cancer
- Element
- Water
Tradition makes it the stone of gentleness and self-love: it is said to soothe emotional wounds, encourage kindness and smooth relationships. It is the stone most often given as a gift, placed in the bedroom or worn as a pendant over the heart.
The virtues described here belong to tradition and cultural heritage. They are in no way medical advice and never replace a consultation.
Frequently asked questions
Why is my rose quartz fading?
Prolonged sunlight degrades the nano-inclusions responsible for the colour. The process is slow but irreversible: keep it out of direct light.
Rose quartz or morganite?
Morganite is a beryl: harder (7.5-8), denser, transparent and often peachy pink. It is worth a hundred times more. Rose quartz is translucent and milky.
Can it go in water?
Yes, with no risk at all: it is a quartz with no cleavage and no porosity. Only avoid boiling water and thermal shock.