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Learn what 999 and 9999 hallmarks on gold indicate, why they matter, and how they affect value, durability, and collectibility.

Discover why a 750 stamp indicates 18-karat gold, how it affects value, and smart tips for buying or selling jewelry marked 750.

Understand karat gold purity: 24K, 18K, 14K, 10K, and 9K all contain different percentages of pure gold. Learn the exact numbers and why they matter.

Discover why Kashmir sapphires are considered the finest blue sapphires on earth, how much they’re worth, and what to know before you buy or sell.

Among all sapphire hues, a richly saturated, velvety royal blue commands the highest prices, though rare padparadscha stones sometimes rival it.

Learn what gives Mikimoto pearls their prestige, typical price ranges, and how to judge authenticity, condition, and resale value.