The Complete Guide To
Amethyst
Katela. Mohs 7. The one great purple gemstone almost anyone can own in a large, clean, beautifully cut size — which is exactly why the cut is the part worth paying for.
At a glance
Amethyst
Quartz, coloured purple by traces of iron and natural irradiation. Plentiful in large clean sizes, which keeps prices sane and puts the emphasis on colour and cutting.
- Mohs 7
- February birthstone
- Saturn / Shani
- 6th anniversary
- Hardness (Mohs)
- 7
- Family
- Quartz
- Colour range
- Pale lilac to grape to deep royal purple
- Key origins
- Brazil, Uruguay, Zambia, India, Bolivia
- Planet
- Saturn (Shani)
- Birth month
- February
- Common treatment
- Usually none; heat used to lighten
- Daily wear
- Good, with sensible care
- Also known as
- Katela, Jamunia
- Refractive index
- 1.544 – 1.553
Chapter 01 · Overview
The purple stone you can actually have in the size you want
Amethyst is quartz, coloured purple by traces of iron that have been altered by natural irradiation deep in the earth. It forms in geodes and cavities, sometimes in crystals the length of a forearm, which is why a clean 10 carat amethyst is ordinary and a clean 10 carat purple sapphire is not.
Be honest about what that means. Amethyst is not rare. Until large Brazilian deposits were found in the nineteenth century it was priced alongside the great gemstones, and then supply arrived and the price fell. What survived that fall is the colour itself, which remains one of the most beautiful in jewellery, and the fact that you can have it in a size and a cut that would be unaffordable in any other purple stone.
- Mohs 7 — fine for everyday wear with sensible care, though softer than sapphire or ruby
- Large, clean, well-saturated stones are genuinely affordable
- Colour runs from pale lilac to deep royal purple with red or blue flashes
- Both the February birthstone and the traditional sixth anniversary stone
- Worn in Vedic tradition as the substitute stone for Blue Sapphire
One thing to know first: because the rough is plentiful, almost none of the price of a good amethyst is rarity. It is colour and cutting. That is unusual among gemstones, and it is entirely in your favour — you can insist on an excellent cut without paying a premium for it.
Chapter 02 · Quality
What separates a good amethyst from a great one
Natural vs Lab-Grown Amethyst
Both are amethyst. One formed in a geode over millions of years, the other in a laboratory over weeks. The difference is origin, not authenticity.
Natural Amethyst
- Formed over millions of years in geodes and volcanic cavities
- Colour zoning is normal and is part of how it grew
- Origin can often be narrowed by a lab from inclusions
- No meaningful premium over lab material at commercial grades
- The only material traditionally used for astrological wear
Lab-Grown Amethyst
- Chemically and optically identical to natural amethyst
- Perfectly even colour, with no zoning to work around
- Effectively unlimited supply in any size or grade
- Very hard to separate without advanced laboratory testing
- Must be disclosed as lab-grown at the point of sale
Origin is worth asking about on natural material. Uruguayan amethyst tends to be deeper and more saturated and is generally the finest commercial material; Brazilian is the largest source and often lighter, with huge sizes available; Zambian is rich and slightly reddish. Because lab amethyst is so difficult to distinguish and so inexpensive to produce, prices for natural amethyst stay low across the board — ask for disclosure in writing and treat a large stone at an implausible price with suspicion.
Chapter 04 · Shapes & Cuts
Which cut suits you
With amethyst, the shape is a matter of taste and the quality of the cutting is a matter of value. Here is what each outline gives you.
Oval
The most common amethyst cut. It follows the rough efficiently and gives the cutter room to place the colour well, so ovals often show the most even purple for the money. Elongating on the finger.
Cushion
A soft square with rounded corners. Holds colour in the centre and reads slightly larger than an oval of the same weight, which suits paler material especially well.
Round
The most brilliant outline and the least forgiving. Since rough is cheap, the wastage matters little here — which makes round a good place to insist on precision or concave cutting for maximum sparkle.
Emerald
A step cut with long, clean facets that show colour as broad flashes rather than sparkle. It demands even saturation and clean material, both of which amethyst supplies readily. Quietly modern.
Pear
A teardrop that flatters the hand and works as well in a pendant as a ring. Watch the point — it is the most vulnerable part of any Mohs 7 stone and needs a protective setting.
Cabochon
Polished rather than faceted. Used for heavily zoned or included material and for traditional astrological settings, where an unfaceted dome touching the skin is often preferred.
Chapter 05 · Astrology
Amethyst and Saturn
The traditional Vedic profile for Katela — worn as the substitute stone for Neelam, and in larger weights.
Saturn (Shani)
Planet of discipline, patience, structure & karma
Amethyst (Katela / Jamunia)
- Planet
- Saturn
- Day to wear
- Saturday
- Time
- Evening, during Shani hora
- Metal
- Silver
- Finger
- Middle Finger
- Colour
- Purple
- Mantra
- Om Sham Shanicharaya Namah
- Minimum weight
- 5 to 7 Ratti
Traditionally worn by
- Focus
- Patience
- Sobriety
- Study
- Calm
- Meditation
Varniya Note
Amethyst is the traditional upratna, or substitute stone, for Blue Sapphire. It is worn for Saturn when Neelam is out of reach on price or is considered too strong to begin with. Substitutes are traditionally worn in larger sizes than the primary stone, which is why the recommended weight is higher. Astrological gemstone selection is a personal belief — please consult a qualified astrologer before choosing a stone for astrological purposes.
Why Amethyst?
- The traditional substitute stone for Blue Sapphire, worn for Saturn
- Affordable in the larger weights that substitutes are worn in
- Mohs 7 — practical for a ring worn every day with sensible care
- Widely available untreated, which tradition prefers
- Set so the stone touches the skin, as tradition requires
Chapter 06 · Ratti & Carat
Ratti to carat, and how much to wear
Ratti is the traditional Indian unit still used for gemstones. One Ratti is approximately 0.91 carat, or 0.182 grams. Amethyst is worn in larger weights than Blue Sapphire because it is a substitute stone — and because large stones remain affordable.
| 5 Ratti | 7 Ratti | 9 Ratti | 11 Ratti | 13 Ratti | |
|---|---|---|---|---|---|
| Carat (approx) | 4.55 ct | 6.37 ct | 8.19 ct | 10.01 ct | 11.83 ct |
| Weight in grams | 0.91 g | 1.27 g | 1.64 g | 2.00 g | 2.37 g |
| Why this weight | Usual minimum for a substitute stone | Most common first choice | Standard weight for upratna wear | Larger hands, bold settings | Still affordable at this size |
| Price band | |||||
| Commonly set as | Slim fingers, pendants | Everyday rings | Everyday and statement rings | Statement rings | Statement rings, pendants |
Swipe to see more weights
Chapter 07 · How to Buy
Six things to check before you pay
Amethyst is inexpensive enough that some sellers stop trying — poor cutting, obvious zoning and vague disclosure all pass unchallenged because the price is low. It costs very little to buy well instead. Here is the short list.
- Check the colour is even across the whole face, not banded or patchy
- Look straight down for a window — if you can read print through the centre, walk away
- Insist on an excellent cut; at these prices there is no reason to accept less
- Ask in writing whether the stone is natural or lab-grown, and whether it has been heated
- View it in daylight and under warm indoor light, since dark stones close up indoors
- Make sure the return window is long enough to get a second opinion
Worth knowing: lab-grown amethyst is chemically identical to natural and extremely difficult to distinguish without advanced testing, so disclosure is the only real protection — get it in writing. Dyed quartz, purple glass and coated stones also appear at the low end. And if amethyst is heated far enough it turns yellow-orange; most citrine on the market began life as amethyst.
Chapter 08 · Alternatives
Amethyst and its alternatives
If you want purple with more hardness, or a different kind of purple altogether, these are the honest comparisons.
| Amethyst | Purple Sapphire | Iolite | Tanzanite | Purple Spinel | Lab Amethyst | |
|---|---|---|---|---|---|---|
| Hardness (Mohs) | 7 | 9 | 7–7.5 | 6–7 | 8 | 7 |
| Brilliance | ||||||
| Colour | Lilac to deep royal purple | Violet to reddish purple | Violet-blue, strongly pleochroic | Violet-blue to purple | Grape to reddish purple | Perfectly even purple |
| Daily Wear | Good, with care | Excellent | Good | With care | Excellent | Good, with care |
| Budget | ||||||
| Best For | Large purple at a sane price | A lifetime everyday stone | An accessible violet alternative | Colour lovers, occasion wear | Collectors, no treatment | Unlimited size, must be disclosed |
Swipe to compare more
Chapter 09 · Care
Looking after an Amethyst
Easy to live with, with one real vulnerability — light and heat. Five habits and you are done.
-
1
Keep it out of the sun
This is the one rule that matters. Amethyst fades with prolonged sunlight and with heat — the purple can drift towards grey or disappear altogether, and it does not come back. Do not leave a piece on a sunny windowsill, in a car dashboard or in a display lit by hot lamps.
-
2
Wear it with sensible care
At Mohs 7 amethyst is fine for everyday rings, but it is softer than sapphire and will scuff over years of hard wear. Dust contains quartz, so a stone worn constantly without cleaning slowly loses polish. A protective setting helps.
-
3
Clean it gently
Warm water, a drop of mild dish soap and a soft brush. Rinse and pat dry. Avoid steam cleaners entirely and treat ultrasonics with caution, since heat and vibration are the two things this stone likes least.
-
4
Warn the jeweller before hot work
Always tell whoever is sizing or repairing the piece that the stone is amethyst. Torch heat during resizing or retipping can lighten or discolour it permanently. The stone should come out of the setting first.
-
5
Store it separately and check yearly
Keep it in its own soft pouch, away from harder stones that will scratch it. Bring the piece in once a year so we can check the setting, re-tighten the prongs and re-polish the metal.
Ready when you are
Shop Amethyst
Every stone disclosed, natural or lab-grown, treated or not.
Chapter 10 · Questions
Amethyst FAQs
Is Amethyst hard enough for daily wear?
Yes, with sensible care. At Mohs 7 it handles an everyday ring, but it is softer than sapphire and will pick up surface scuffs over years of hard wear. A protective setting and taking the ring off for rough work will keep it looking new. The bigger risk is not scratching but sunlight, which fades the colour.
Does Amethyst really fade in sunlight?
It does. Prolonged sunlight and heat will lighten amethyst, sometimes towards grey and sometimes almost completely, and the change is permanent. Wearing a piece outdoors is not the problem — leaving it on a windowsill, on a car dashboard or under hot display lighting is. Store it out of direct light.
Why is Amethyst so much cheaper than other purple gemstones?
Supply. Large deposits in Brazil, Uruguay and Zambia produce clean rough in great quantity and in very large crystals, and lab-grown material is both identical and cheap to make. There is no rarity premium at commercial grades. The upside is that you can buy a large, clean, excellently cut stone for a sum that would not buy a small purple sapphire.
Is Amethyst treated?
Most amethyst is untreated. Heat is sometimes used to lighten stones that are too dark, and irradiation is occasionally used to deepen pale material. Heating amethyst further turns it yellow-orange, and most citrine on the market started out as amethyst. Ask for treatment disclosure in writing either way.
Can Amethyst be worn instead of Blue Sapphire?
In Vedic tradition, yes — amethyst is the recognised upratna, or substitute stone, for Blue Sapphire and is worn for Saturn when Neelam is unaffordable or considered too strong to start with. Substitute stones are traditionally worn in larger weights, typically 5 to 7 Ratti and above. This is a matter of tradition and personal belief, and a qualified astrologer should confirm the choice.
Is lab-grown Amethyst real amethyst?
Chemically and optically it is identical to natural amethyst, and it is very difficult to distinguish without advanced laboratory testing. The difference is where it formed, not what it is. It must be disclosed at the point of sale, and it is not traditionally used for astrological purposes.
What does Siberian Amethyst mean?
It is the traditional name for the finest grade of colour — a deep purple showing flashes of red. Almost no material sold under that name today comes from Siberia; the term now describes the colour rather than the origin. Treat it as a quality description and ask separately where the stone was mined.
Still deciding?
We'll shortlist stones for you
Tell us your budget, your setting and whether you are buying for the colour or for Saturn. We'll send you three options with the reasoning behind each.
