Discover the Beauty of Colored Gemstones
Gemstone Guide
The Four Key Factors for Gemstones
Color
Color is the most critical factor in a gemstone’s value. This includes:
• Hue (the actual color)
• Tone (lightness or darkness)
• Saturation (intensity or vividness)
Highly saturated, well-balanced colors are generally the most desirable.
Clarity
Most colored gemstones naturally contain inclusions. Some inclusions are expected and accepted, especially in stones like emeralds. The goal is overall beauty rather than flawlessness.
Cut
Gemstones are cut to enhance color and brilliance rather than maximize sparkle. Skilled cutting improves light reflection, symmetry, and overall appearance.
Carat Weight
Gemstone size affects value, but larger stones with poor color or clarity may be less desirable than smaller, higher-quality stones.
Precious vs. Semi-Precious Gemstones
Traditionally, gemstones are grouped into two categories:
Precious Gemstones
These are valued for their rarity, durability, and long-standing desirability:
• Ruby
• Sapphire
• Emerald
Semi-Precious Gemstones
This category includes a wide variety of beautiful stones prized for color and individuality, such as:
• Amethyst
• Aquamarine
• Garnet
• Peridot
• Topaz
• Tourmaline
• Citrine
At Gold Castle Jewelers, we believe beauty and quality matter more than labels, and both precious and semi-precious gemstones can make exceptional jewelry.
Common Gemstone Treatments
Many gemstones undergo treatments to enhance their appearance. These are widely accepted in the jewelry industry when properly disclosed.
Common treatments include:
• Heat treatment (very common and permanent)
• Oil or resin filling (commonly used for emeralds)
• Irradiation or coating (used for certain stones)
Gold Castle Jewelers believes in transparency and will always explain any treatments used.
Birthstones & Meaning
Gemstones are often chosen for their symbolism and connection to birth months, making them meaningful gifts for birthdays, anniversaries, and personal milestones. Each birthstone carries its own story, color, and tradition.
January ◆ Garnet
Symbolizes protection, strength, and lasting friendship. Known for its deep red tones, garnet has been cherished for centuries.
February ◆ Amethyst
Represents peace, clarity, and balance. Amethyst’s rich purple color has long been associated with wisdom and calm.
March ◆ Aquamarine
Symbolizes serenity, courage, and clarity. Its soft blue hues evoke the calm of the sea.
April ◆ Diamond
Traditionally associated with strength and enduring love. (Diamonds are explored in detail in our Diamond Guide.)
May ◆ Emerald
Represents growth, renewal, and prosperity. Emeralds are prized for their vivid green color and natural character.
June ◆ Pearl / Alexandrite
Pearl: Symbolizes purity and elegance
Alexandrite: Known for its rare color-changing properties and uniqueness
July ◆ Ruby
Represents passion, love, and vitality. Rubies are among the most valued colored gemstones.
August ◆ Peridot
Symbolizes strength and positivity. Peridot’s bright green color is fresh and distinctive.
September ◆ Sapphire
Represents wisdom, loyalty, and truth. Best known in blue, sapphires also come in many colors.
October 🌈 Opal / ◆ Tourmaline
Opal: Known for its play of color and creativity
Tourmaline: Valued for its wide range of vibrant hues
November ◆ Topaz / ◆ Citrine
Topaz: Symbolizes strength and affection
Citrine: Associated with warmth, joy, and prosperity
December ◆ Tanzanite / ◆ Blue Topaz / ◆ Turquoise
Tanzanite: Rare and elegant with deep blue-violet tones
Blue Topaz: Calm and refined
Turquoise: One of the oldest known gemstones, symbolizing protection
Why Birthstones Matter
Birthstones add a personal layer of meaning to jewelry, making each piece feel intentional and unique. Whether chosen for tradition, color, or symbolism, birthstone jewelry is a timeless way to celebrate life’s moments.
Durability & Everyday Wear
Not all gemstones are suited for daily wear. Hardness and toughness matter, especially for rings.
Best for everyday wear:
• Sapphire
• Ruby
• Spinel
Better for occasional wear:
• Emerald
• Opal
• Tanzanite
Our jewelers can help you choose a gemstone that fits your lifestyle.
Expert Guidance You Can Trust
Choosing a gemstone is a personal decision. At Gold Castle Jewelers, our experienced jewelers provide honest guidance to help you find a gemstone that fits your style, budget, and purpose—whether you’re purchasing a gift, designing custom jewelry, or restoring a treasured piece.
If you have questions or would like to see gemstones in person, we invite you to visit our store or contact our team.