Today we’re going to answer a question that many people are curious about: Is a 1-carat diamond still a good investment in today’s market? And what should you know before investing?
All the key insights are here—so don’t miss them.
Currently, the price of a 1-carat diamond ranges from 60,000 to 600,000 THB. The wide price range exists because diamond prices depend heavily on their quality. When buying a diamond, you must consider factors such as color, clarity, cut quality, and other important characteristics.
Is a 1-Carat Diamond Worth Investing In?
A 1-carat diamond can still be considered a worthwhile investment. However, it is important to understand that diamond investment is generally long-term, typically 3–5 years or more.
For investment purposes, it is recommended to focus on high-quality diamonds, often referred to as “top-grade” or “investment-grade” diamonds, and ensure they come with certification from a reputable gemological institute such as the Gemological Institute of America (GIA).
Compared to gold, diamonds tend to have lower price volatility. Because of this, diamond investment may be suitable for investors who prefer lower risk and stable asset holding. At the same time, investors should not need immediate liquidity and must be willing to hold the diamond for a longer period.
What You Should Know Before Investing in Diamonds
1. Choose Diamonds That Maintain Strong Resale Value
As mentioned earlier, if you plan to invest in diamonds, you should choose high-quality stones so that they can be resold in the future at a good price.
Diamond quality is evaluated using the 4Cs:
- Cut – the quality of the diamond’s cut and brilliance
- Color – the absence of color, with D being the highest grade
- Carat – the diamond’s weight
- Clarity – the presence or absence of internal inclusions
For investment-grade diamonds, consider:
- Color: D Color (often referred to as “perfect white”)
- Cut: Excellent or Triple Excellent
- Clarity: FL, IF, VVS1, or VVS2 (inclusions invisible to the naked eye)
- Carat Weight: ideally 0.30 carats or higher
These characteristics help ensure the diamond retains higher resale value in the future.
2. Understand Fluorescence
Another important factor when investing in diamonds is Fluorescence.
Fluorescence refers to a phenomenon where certain diamonds emit visible light when exposed to ultraviolet (UV) light. In most cases, the diamond emits a blue glow under UV light.
Approximately 30–50% of natural diamonds exhibit some level of fluorescence. The intensity can vary from None, Faint, Medium, Strong, to Very Strong.
For investment purposes, it is generally recommended to choose diamonds with None (no fluorescence), as these are typically more desirable and hold higher market value.
3. Know the Rapaport Price List
If you are new to diamond investing, you should understand the Rapaport Price List.
Rapaport is considered the international benchmark pricing guide for diamonds used across the global diamond and jewelry trade. It helps standardize pricing references among diamond dealers.
The Rapaport list categorizes diamonds by factors such as:
- Diamond shape (Round or Fancy shapes)
- Carat weight ranges
- Color and clarity grades
Many jewelry retailers use the Rapaport price as a reference point when setting their selling prices. However, actual retail prices may vary because jewelers often apply discounts from the Rapaport price, depending on promotions, market demand, or specific sales campaigns.
By now, this should help answer the question: Is a 1-carat diamond worth investing in?
While diamonds can be a valuable asset, it is important to remember that diamonds are not highly liquid assets like gold. Their prices are also very sensitive to quality factors.
For example, a 1-carat diamond may range from 60,000 to 600,000 THB, depending on its grade and characteristics.
Therefore, diamond investment should be approached as a long-term strategy rather than short-term speculation. Ideally, investors should plan to hold the diamond for at least 3–5 years in order to potentially benefit from value appreciation.
In short, if you select the right quality diamond, purchase with proper certification, and hold it long-term, a 1-carat diamond can be a meaningful and stable investment asset.