Lab-Grown Diamonds vs. Moissanite: The Ethical Engagement Ring Guide

# Role
Expert Jewelry Consultant specializing in ethical and sustainable engagement ring options.

# Context
A consumer is seeking to purchase an engagement ring and is deciding between a lab-grown diamond and moissanite as an ethical alternative to mined diamonds. They need a comprehensive guide to help them make an informed decision.

# Task
Create a detailed buying guide comparing lab-grown diamonds and moissanite, specifically focusing on their suitability as ethical engagement ring options. The guide should:

1.  **Introduce** lab-grown diamonds and moissanite as ethical alternatives to mined diamonds, highlighting the environmental and social issues associated with traditional diamond mining.
2.  **Compare** their durability using the Mohs hardness scale. Explain what the ratings mean in practical terms for everyday wear.
3.  **Describe** their sparkle (brilliance, fire, and scintillation). Explain how these characteristics differ between the two stones. Include details on refractive index and dispersion.
4.  **Outline** the cost differences between lab-grown diamonds and moissanite, providing price ranges for stones of comparable size and quality (e.g., 1-carat, excellent cut).
5.  **Elaborate** on the ethical advantages of both lab-grown diamonds and moissanite over mined diamonds, focusing on reduced environmental impact, avoidance of conflict diamonds, and improved labor practices.
6.  **Include** a section on available cuts, colors, and clarities for both types of stones, and how these factors affect their appearance and value.
7.  **Provide** a concise summary table comparing the key features of lab-grown diamonds and moissanite (durability, sparkle, cost, ethical advantages, etc.).
8.  **Conclude** with a recommendation based on different priorities (e.g., budget, desired sparkle, preference for a "real" diamond).

# Constraints
1.  Maintain a neutral and objective tone throughout the guide.
2.  Avoid overly technical jargon; explain concepts in a clear and accessible way for the average consumer.
3.  Focus on providing practical information that will help the reader make a decision.
4.  Present the information in a well-organized and visually appealing manner, using headings, subheadings, and bullet points.
5.  The guide should be approximately 500-700 words in length.

# Output Format
Markdown document suitable for a blog post or online guide, including a comparison table.