Precious Stones, Jewelry

The four most sought-after precious gemstones are diamonds, sapphires, emeralds, and rubies.

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Precious stones are distinguished by their quality, their rarity and the beauty of their colours. There are only four precious stones: diamond, sapphire, ruby and emerald. All other stones are therefore called semi-precious stones.

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Yes, Opal is an extremely precious gem. Gem Black, Boulder, Crystal and White Opals are the world's #1 most valuable commercially available gemstone, yet they are complex with an exponentially large range of valuation characteristics than Diamonds, Rubies, Emeralds, Sapphires or Tanzanites.

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The five traditional cardinal gems are:

1. Amethyst (purple) Rare and precious in the Old World until large deposits were found in Brazil.
2. Diamond (transparent)
3. Emerald (green)
4. Ruby (red)
5. Sapphire (blue)

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Gemstones are composed of a variety of minerals, rocks, and organic material. With over 300 gemstones currently documented, there are bound to be some that are significantly more rare and valuable than the iconic diamond.

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Thanks partially to Chinese demand, rare imperial green jade, a translucent stone that's been compared to fine emerald, is the most expensive gem in the world, worth more per gram than diamonds.

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Opal is found around the world (Brazil, Mexico, Honduras and the western US) however Australia produces 95% of the world's precious opal and it is our official national gemstone.

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