
Pure red diamonds are so rare that only a handful have ever been discovered, mostly from the now-closed Argyle Mine in Australia.

Indicative value:
⭐ $1,000,000–3,000,000 per carat for top stones
(Record: Argyle Phoenix ≈ $2.7M per carat)
Why they are more precious than white diamonds:

Discovered in Myanmar in the 1950s, Painite remained nearly impossible to find for decades.
What makes it exceptional:

Painite is still extremely scarce.
Modern estimates place gem-quality Painite in the range of about $50,000–60,000+ per carat, with some recent analyses suggesting values above $60,000 per carat for top material.

High-quality Burmese Imperial Jade can command prices higher than diamonds per carat.
Key features:

Indicative value:
Top “Imperial Green” jadeite: $20,000–30,000+ per carat, with exceptional historical pieces much higher.

Rare natural alexandrite shows a dramatic color change: green in daylight, red under warm light.
Why it surpasses diamonds in value:

Natural alexandrite with a strong green-to-red color change is extremely rare.
Auction records and specialist guides indicate that the finest stones can reach $30,000+ per carat, and in some cases estimates go up to around $70,000 per carat for exceptional large gems.
Indicative value:
High-end alexandrite: roughly $15,000–70,000 per carat, depending on size and color change.

The finest rubies from Mogok, Myanmar—known as “Pigeon Blood”—often sell for several times the price of diamonds per carat.
What makes them extraordinary:

The most famous example, the Sunrise Ruby (25.59 ct), sold for about $30.3 million, setting a record of around $1.18 million per carat.
Indicative value:
Top Burmese pigeon blood rubies can range from about $30,000–50,000 per carat for smaller fine stones, up to hundreds of thousands of dollars per carat for exceptional larger gems, with record pieces above $1,000,000 per carat.

Discovered in Australia in 1967, Musgravite remains incredibly rare, with only a small number of gem-quality stones ever found.
Why it is more valuable than diamonds:

Recent market analyses place high-quality stones at approximately $20,000–40,000 per carat, with some exceptional pieces reported closer to $35,000+ per carat.
Indicative value:
Fine musgravite: about $20,000–40,000 per carat, potentially higher for exceptional clarity and color..

Transparent gem-quality Grandidierite is exceptionally scarce and commands high prices.
Key points:

Transparent, faceted grandidierite is extremely rare.
Specialist sources estimate that fine quality stones can reach $8,000–20,000 per carat, with the very best examples exceeding this range. STARLANKA+2gemselect.com+2
Indicative value:
Fine grandidierite: approximately $8,000–20,000 per carat.
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