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Colour: Colourless also pink, yellow, blue
Symbolism: Love, strength, eternity
Hardness: 10 (Mohs scale)
Uses: Engagement rings, earrings, necklaces
Why popular: Unmatched brilliance, timeless, extremely durable
Colour: Most known for deep blue, but comes in many colours.
Symbolism: Wisdom, loyalty, truth
Hardness: 9 (Mohs scale)
Uses: Rings & statement pieces
Why popular: Stunning colour, excellent durability
Colour: Deep red (pigeon blood red is the most prized)
Symbolism: Passion, protection, vitality
Hardness: 9 (Mohs scale)
Uses: High-end rings, pendants, vintage settings
Why popular: Rich colour and rarity
Colour: Green (vibrant to bluish-green)
Symbolism: Renewal, love, fertility
Hardness: 7.5–8 (can be brittle due to inclusions)
Uses: Statement rings, antique-style jewellery
Why popular: Iconic colour, historic prestige
Colour: Purple (lavender to deep violet)
Symbolism: Calm, clarity, protection
Hardness: 7 (Mohs scale)
Uses: Affordable statement jewellery
Why popular: Vibrant, affordable, spiritual appeal
Colour: Blue is most popular, also in yellow, pink & clear
Symbolism: Strength, affection, good fortune
Hardness: 8 (Mohs scale)
Uses: Birthstone jewellery, earrings, rings
Why popular: Affordable, wide colour range
Colour: Light blue to sea green
Symbolism: Tranquility, communication, ocean energy
Hardness: 7.5–8 (Mohs scale)
Uses: Rings, bridal jewellery
Why popular: Soft, elegant colour with oceanic vibes
Colour: Olive to lime green
Symbolism: Abundance, prosperity, protection
Hardness: 6.5–7 (Mohs scale)
Uses: Summer-themed jewellery, August birthstones
Why popular: Distinct green tone, good value
Colour: Iridescent rainbow play (white, black, fire)
Symbolism: Creativity, inspiration, spontaneity
Hardness: 5.5–6.5 (Mohs scale)
Uses: Art and custom jewellery
Why popular: Unique visual effects
Colour: Deep red (also orange, green, purple)
Symbolism: Love, energy, grounding
Hardness: 6.5–7.5 (Mohs scale)
Uses: Vintage and bohemian styles
Why popular: Rich, earthy tones and historical use
Moissanite: Diamond alternative with more fire (brilliance), very hard (9.25)
Spinel: Often mistaken for ruby or sapphire, now gaining popularity
Tanzanite: Mostly vivid violet-blue, softer (6–7), rare and eye-catching
Tourmaline: Wide colour range, including pink, green, and watermelon
The Mohs scale (or Mohs Hardness Scale) is a system used to measure the scratch resistance of minerals and materials. It was created in 1812 by Friedrich Mohs, a German geologist and mineralogist.
It ranks minerals on a scale from 1 (softest) to 10 (hardest).
A mineral with a higher number can scratch a mineral with a lower number.
It’s a relative scale, not linear - diamond is far harder than corundum, even though they’re 9 and 10.
Hardness ≠ toughness: A hard gem can still be brittle (like emerald).
The scale measures scratch resistance, not resistance to shattering or impact.
1
2
3
4
5
6
7
8
9
10
Talc
Gypsum
Calcite
Fluorite
Apatite
Orthoclase
Quartz
Topaz
Corundum
Diamond
Baby powder
Chalk
Copper coin, some marbles
Fluoride in toothpaste
Tooth enamel
Feldspar in granite
Electronics, glass making
Jewellery stones
Ruby and sapphire
The hardest natural material
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