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The porosity and makeup of most stone does, however, leave it prone to certain types of damage if unsealed. Staining is the most common form of damage. It is the result of oils or other liquids penetrating deeply into the capillary channels and depositing material that is effectively impossible to remove without destroying the stone.
In August on 2023, a natural burmese stone, noted as the second-most expensive ruby to be sold in auction at $3.3 million. [8] The stone is set in an 18-karat yellow gold setting, surrounded by 10 0.4-0.5 carats each.
Prasiolite is a rare stone in nature; artificial prasiolite is produced from amethyst. [4] Most amethyst will turn yellow or orange when heated, producing heat-treated amethysts which are often marketed as citrine , but some amethyst will turn green when treated.
18. Platinum. Cost: $33.02 per gram Platinum is a beautiful precious metal that is in a similar category as gold and silver. All three of these metals are frequently traded in the global markets ...
The contract was the most expensive and most demanding in the history of Yule marble at $1,080,000. The marble came out of Quarry 3, with the first shipment leaving Marble on 25 May 1914 and the final on 16 June 1916. The high standards resulted in a high rejection rate, yet the contract was completed 5 months ahead of schedule.
So it was expensive, and if you wanted to have something in blue, you had to pay more,” he said. Red, yellow and black were much easier to produce because natural materials like stone and sand ...
This is a list of the highest known prices paid for philatelic items, including stamps and covers.The current record price for a single stamp is US$9,480,000 paid for the British Guiana 1c magenta.
The Sunrise Ruby [1] [2] [3] has been the world's most expensive ruby, most expensive coloured gemstone, and most expensive gemstone other than a diamond [2] [3] [4] until the discovery of the Estrela de Fura. Originally mined in Myanmar, its current name is derived from a poem of the same name, written by the 13th-century Sufi poet Rumi. [5]
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