Eye Clean refers to whether diamond inclusions are visible to the naked eye, based on a diamond expert's subjective judgment. Exchanges and refunds due to differences in this assessment are not possible, so for a safer purchase, it's recommended to choose a stone without black inclusions.

Milky refers to a foggy or hazy appearance inside a diamond, which can reduce its transparency and sparkle. The determination of milkiness is based on a diamond expert's subjective judgment, and differences in this assessment do not qualify for exchanges or refunds. For a more accurate selection, it's advisable to choose diamonds with high transparency.

Blue Label is a guarantee service provided by Cornerstone that allows for a safe and simple 100% refund within 30 days—a diamond certification mark.

Heart & Arrow is a light reflection phenomenon that appears only when a diamond is cut to perfect proportions. Visible only in the highest quality cuts, it occurs in diamonds precisely cut with a crown angle of 34.5 degrees and a pavilion angle of 40.8 degrees. The special and perfect Heart & Arrow diamonds, which are only 0.01%, are marked with the Heart & Arrow mark on their certificates.

14k Gold: With 58.5% pure gold content, 14K gold is resistant to scratches and deformation, making it suitable for secure diamond settings. It can be worn comfortably in daily life and is recommended for active customers. However, the purity is relatively low, so if you have sensitive skin or metal allergies, it's better to choose 18K gold or platinum.

18k Gold: With 75% rich gold content, it has a softer and deeper shine, creating a luxurious and classic atmosphere. The high purity makes it suitable for customers with sensitive skin as it causes less skin irritation or allergic reactions.

24k Gold: Made up of 99.9% pure gold, 24K gold is the purest form of gold, crafted with precise gold content and has high intrinsic value. You can fully experience the deep, warm color and substantial weight of pure gold.

Platinum (PT950) with a high purity of 95% or more is a pure white metal with a deep and soft luster that doesn't fade or deform over time, making it the most premium metal material. Its Allergy-Free characteristic allows even those with sensitive skin to wear it with peace of mind.

Platinum (PT900) with 90% purity is a premium white metal with luxurious qualities that won't tarnish or deform. Its low allergy potential makes it suitable for sensitive skin.

Platinum (PT950) with a high purity of 95% or more is a pure white metal with a deep and soft luster that doesn't fade or deform over time, making it the most premium metal material. Its Allergy-Free characteristic allows even those with sensitive skin to wear it with peace of mind.