Amethyst and citrine are color varieties of quartz (SiO2), offering beautiful colors at remarkably accessible prices. Amethyst (purple) is the February birthstone and has been treasured since antiquity, while citrine (yellow) is the November birthstone and one of the most affordable yellow gemstones. Both are workhorses of commercial jewelry.
Amethyst: The Purple Quartz
Amethyst gets its purple color from iron (Fe3+) and natural irradiation. Color ranges from pale lavender to deep royal purple, with the most valuable stones showing a rich purple with red and blue flashes ("Siberian" color, regardless of origin).
| Color Grade | Description | Price Multiplier |
|---|---|---|
| Deep Royal Purple | Rich purple with red/blue flashes | 3-5x |
| Vivid Purple | Strong, saturated purple | 2-3x |
| Medium Purple | Good color, decent saturation | 1-1.8x |
| Light Purple/Lavender | Pale, delicate purple | 0.3-1x |
| Pinkish-Purple | Pink modifier, lighter | 0.4-1.2x |
Amethyst Origins
- Brazil — Largest producer, light to medium purple, very affordable
- Uruguay — Deep, saturated purple, higher quality
- Zambia — Deep purple with good clarity, growing supply
- Russia (Siberia) — Historical benchmark, rare today
- USA (Arizona, Georgia) — Small production, domestic interest
Citrine: The Yellow Quartz
Natural citrine is rare — most commercial citrine is actually amethyst or smoky quartz heat-treated at 400-500°C to produce yellow to orange-brown color. Natural citrine tends to be a pale yellow, while heat-treated material shows richer golden and orange tones.
| Type | Color | Price Range (per ct) | Availability |
|---|---|---|---|
| Heat-treated (golden) | Rich golden yellow | $2-15 | Very common |
| Heat-treated (orange) | Orange-brown (Madeira) | $3-20 | Common |
| Natural citrine | Pale to medium yellow | $10-50 | Rare |
| Lemon quartz | Bright lemon yellow | $1-8 | Common |
Clarity and Quality
Both amethyst and citrine are typically eye-clean in commercial sizes. Amethyst may show color zoning (banding of lighter and darker purple), which can be desirable in designer cuts but is generally avoided in calibrated commercial stones. Citrine is usually very clean with excellent transparency.
Size Availability and Pricing
Quartz family gems are among the most affordable large gemstones. Eye-clean amethyst and citrine in sizes of 10-50 carats are readily available, making them ideal for statement jewelry.
| Size | Amethyst (per ct) | Citrine (per ct) | Typical Use |
|---|---|---|---|
| 3-5mm | $1-5 | $1-5 | Earrings, small rings |
| 6-8mm | $3-15 | $2-10 | Rings, pendants |
| 9-12mm | $8-30 | $5-20 | Statement pieces |
| 13-16mm | $15-60 | $10-40 | Bold designs |
| 17mm+ | $30-150 | $20-100 | Collector/runway |
Durability and Care
Quartz rates 7 on the Mohs scale, making it durable enough for everyday jewelry. However, quartz has poor toughness and can chip or fracture with sharp blows. Amethyst is also photosensitive — prolonged exposure to strong sunlight can cause fading. Store away from direct light and clean with warm soapy water.
Design and Merchandising Tips
- Color marketing — "Siberian amethyst" and "Madeira citrine" are powerful color names
- Large stones — Big, affordable stones create visual impact at low cost
- Birthday demand — February (amethyst) and November (citrine) drive seasonal sales
- Metal pairing — Amethyst pairs beautifully with rose gold and white gold; citrine with yellow gold and silver
- Layered looks — Affordable prices encourage multi-piece purchases
- Calibrated sizes — Consistent calibrated sizes enable easy setting manufacturing
Frequently Asked Questions
Is citrine always heat-treated?
Most commercial citrine (approximately 90%+) is heat-treated amethyst or smoky quartz. Natural citrine is rare and usually a paler yellow. The heat treatment is permanent, stable, and widely accepted in the industry.
Does amethyst fade in sunlight?
Yes, amethyst is photosensitive. Prolonged exposure to strong sunlight or UV light can cause the purple color to fade. Store amethyst jewelry away from direct light and avoid leaving it on sunny windowsills.
What is the best amethyst color?
The most valuable amethyst shows a deep, rich purple with red and blue flashes (called 'Siberian' color regardless of origin). Very dark stones that appear blackish in low light are less valuable than medium-deep stones with good brightness.
Are amethyst and citrine good for engagement rings?
At 7 Mohs, quartz is durable enough for rings but has lower toughness than sapphire or diamond. For daily-wear engagement rings, protective settings and careful wear are recommended. They are excellent choices for promise rings, right-hand rings, and fashion jewelry.
For more expert gemstone and jewelry guidance, explore our knowledge base or contact our sourcing team at service@holycome.com for wholesale inquiries.