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Yellow sapphire is a variety of corundum distinguished by its yellow color. It is highly valued both as a decorative gemstone and for its astrological significance, particularly in India, where it is considered auspicious and of great value. Symbolizing wisdom, wealth, love, and good fortune, yellow sapphire comes in different shades. The brownish-yellow variety, known as “Nam Khong Yellow,” is especially favored among Thais, while the deep golden-yellow hue (Golden Yellow) is highly popular in international markets.

Emerald is a variety of beryl characterized by its green color. It is one of the four precious gemstones, along with diamond, ruby, and blue sapphire. Emerald symbolizes fertility, prosperity, and new beginnings. Colombia is renowned as the world’s leading source of the finest quality emeralds, with the most valuable stones displaying a vivid deep green color (Vivid Green).

Blue Sapphire is a variety of corundum with a blue color, highly esteemed as one of the most beautiful and valuable gemstones. It is regarded as a symbol of loyalty, virtue, and stability. The most prized and valuable hues are the vivid deep blue known as Royal Blue and the soft cornflower blue, both recognized as the most exquisite and rare shades.

Ruby is a red variety of corundum with high value, often referred to as the 'King of Gemstones.' It has long been regarded as a symbol of power, courage, love, wealth, and prosperity. Beyond its spiritual significance, ruby also carries great economic value. In particular, unheated rubies of exceptional quality can fetch prices reaching hundreds of thousands of US dollars per carat.