Grace Kelly’s Cartier diamond. Mariah Carey’s 35-carat sparkler. Kim Kardashian’s flawless cushion-cut stone.
These aren’t just engagement rings—they’re symbols of jaw-dropping wealth. Grace Kelly’s ring alone is valued at nearly $39 million.
And lately, celebrity rings have been all over the headlines again. Taylor Swift’s engagement ring sparked massive buzz this year, and Georgina Rodríguez’s giant diamond from Cristiano Ronaldo also made waves. But here’s the thing: while stunning, both rings are actually far less expensive than the record-breakers on our list. Taylor’s is estimated at around $550,000, and Georgina’s at about $5 million—impressive, but nowhere near Grace Kelly’s historic $39 million Cartier masterpiece.
That’s why we decided to run this fun thought experiment: If you’re 30 years old today and want to build enough wealth by 65 to afford one of these iconic rings—or anything else on your dream list, like a house, a trip around the world, or even a yacht—how much would you need to invest each month?
Sounds crazy—but it’s actually the perfect way to understand how much consistent investing can build over time.
Step 1: Why We Assume 7%
We’re assuming a 7% annual return—slightly below the stock market’s long-term average of 10%—to account for inflation and taxes. Financial planners often use this number when running long-term projections.
That’s what we’ll use here.
Step 2: The Power of Compounding
Compounding is what happens when your money earns returns, and then those returns themselves start earning returns.
Think of it like a snowball rolling down a hill: it starts small, but the longer it rolls, the bigger it gets.
By investing monthly, you’re giving your money the maximum chance to compound over decades.
Step 3: Dollar-Cost Averaging (Why Monthly Beats “Perfect Timing”)
If you invest a fixed amount every month, you naturally buy more when prices are low and less when prices are high. This is called dollar-cost averaging, and it protects you from the impossible task of trying to “time the market.”
Consistency beats perfection.
The Celebrity Ring Price Tags 💍
Before we dive into the numbers, keep in mind: the exact price of these rings is impossible to know. The values below are based on estimates from jewelers and media reports. Celebrity diamonds aren’t traded on the open market—so treat these as the best guesses from experts.
And yes, a picture is worth a thousand carats—so here are the icons themselves:
- Grace Kelly – $38.8M (10.47-carat Cartier diamond)
2. Mariah Carey – $10M (35-carat emerald-cut diamond)
3. Elizabeth Taylor – $8.8M (33.19-carat Krupp diamond)
4. Kim Kardashian – $8M (20-carat cushion-cut from Kanye West)
5. Beyoncé – $5M (18-carat emerald-cut flawless diamond from Jay-Z)
Honorable Mentions: Jennifer Lopez ($5–7M), Georgina Rodríguez ($5M), Taylor Swift (around $550K).
How Much You’d Need to Invest Monthly (Starting at 30)
With 35 years of compounding at 7%:
| Celebrity Ring | Price Tag | Monthly Investment Needed |
|---|---|---|
| Grace Kelly | $38.8M | $12,500/month |
| Jackie Kennedy | $20M | $6,450/month |
| Mariah Carey | $10M | $3,225/month |
| Elizabeth Taylor | $8.8M | $2,840/month |
| Kim Kardashian | $8M | $2,580/month |
| Beyoncé | $5M | $1,610/month |
| J.Lo | $6M | $1,935/month |
| Georgina Rodríguez | $5M | $1,610/month |
| Taylor Swift | $550K | $175/month |
Step 4: The Real Lesson
Of course, the point here isn’t to plan your retirement around buying Grace Kelly’s Cartier diamond. The real takeaway is understanding what consistent investing can do for your future goals.
Here’s what this exercise teaches us:
- Time is your best friend. At 30, you still have 35 years to grow your money. That’s plenty of time for compounding to work its magic. Even if you feel “late,” starting now makes a huge difference.
- Consistency beats perfection. You don’t need to wait for the “perfect” market moment. Investing monthly—through market ups and downs—adds up over decades.
- Small steps still count. Maybe you can’t set aside thousands per month, but even $200–$300 a month could grow into hundreds of thousands by retirement. That could mean financial freedom, travel, or helping your kids with college.
- Your goals don’t have to be flashy. For us, the rings are just a metaphor. Replace “diamond” with “dream home,” “early retirement,” or “world travel fund.” The same math applies.
- The earlier you start, the easier it is. Someone who begins at 25 could contribute much less each month and still reach the same totals as someone starting at 35 or 40. But if you’re starting at 30—good news—it’s not too late.
- It’s about freedom, not things. The real reward isn’t a diamond—it’s the freedom to say yes to the life you want without financial stress.
Final Word
Celebrity engagement rings are fun to gawk at—but they’re also a reminder of just how powerful consistent investing can be. At 30, you might feel like you’ve already missed the boat. You haven’t. The truth is:
Start now. Be consistent. Let compounding work.
Who knows—by 65, you may not have Grace Kelly’s Cartier masterpiece on your finger, but you’ll have something even better: the financial freedom to say yes to the life you want.
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And if you’re ready to explore further, check out our newsletter rankings below to see which service can guide your next steps.
Ranking of Top Stock Newsletters Based on Last 3 Years of Stock Picks as of December 27, 2025
We are paid subscribers to dozens of stock and option newsletters. We actively track every recommendation from all of these services, calculate performance, and share our results of the top performing stock newsletters whose subscriptions fees are under $500. The main metric to look for is "Return vs S&P500" which is their return above that of the S&P500. So, based on December 27, 2025 prices:
Best Stock Newsletters Last 3 Years' Performance
| Rank | Stock Newsletter | Picks Return | Return vs S&P500 | Picks w Profit | Max % Return | Current Promotion |
|---|---|---|---|---|---|---|
| 1. |  Alpha Picks | 82% | 56% | 76% | 1,583% | January Promotion: Save $50 HERE |
| Summary: 2 picks per month based on Seeking Alpha's Quant Rating; consistently beating the market every year since launch; tells you when to sell and they have sold almost half. See complete details in our full Alpha Picks review. Or get their Premium service to get their QUANT RATINGS on your stocks to better manage your current portfolio--read our Is Seeking Alpha Worth It? article to learn more about their Quant Ratings. | ||||||
| 2. |  Zacks Value Investor | 60% | 40% | 54% | 692% | January Promotion: $1, then $495/yr |
| Summary: 10 stock picks per year on January 1st based on Zacks' Quant Rating; Retail Price is $495/yr and includes 6 different services including those below. Read our Zacks Review. | ||||||
| 3. |  Moby.co | 50% | 16% | 74% | 2,569% | January Promotion: Next pick free! |
| Summary: 60-150 stock picks per year, segmented by industry; consistently beating the market every year; retail price is $199/yr. Read our full Moby Review. | ||||||
| 4. | Zacks Top 10 | 36% | 15% | 71% | 170% | January Promotion: $1, then $495/yr |
| Summary: 10 stock picks per year on January 1st based on Zacks' Quant Rating; Retail Price is $495/yr and includes 6 different services. Read our Zacks Review. | ||||||
| 5. |  TipRanks SmartInvestor | 20% | 9% | 62% | 464% | Current Promotion: Save $180 |
| Summary: About 1 pick/week focusing on short term trades; Lifetime average return of 355% vs S&P500's 149% since 2015. Retail Price is $379/yr. Read our TipRanks Review. | ||||||
| 6. |  Action Alerts Plus | 27% | 5% | 66% | 208% | Current Promotion: None |
| Summary: 100-150 trades per year, lots of buying and selling and short-term trades. Read our Jim Cramer Review. | ||||||
| 7. | Zacks Home Run Investor | 5% | -0.4% | 45% | 241% | January Promotion: $1, then $495/yr |
| Summary: 40-50 stock picks per year based on Zacks' Quant Rating; Retail Price is $495/yr. Read our Zacks Review. | ||||||
| 8. | Dogs of the Dow Strategy | 16% | -1.8% | 43% | 44% | Current Promotion: None |
| Summary: Buy the 10 highest yielding dividends stocks in the Dow Jones Industrial Average on January 1st and sell on Dec 31st each year. | ||||||
| 9. | IBD Leaderboard ETF | 11.4% | -1.8% | n/a | n/a | January Promotion: NONE |
| Summary: Maintains top 50 stocks to invest in based on IBD algorithm; Retail Price is $495/yr. Read our Investors Business Daily Review. | ||||||
| 10. |  Stock Advisor | 34% | -3.9% | 75% | 289% | January Promotion: Get $100 Off |
| Summary: 2 picks/month and 2 Best Buy Stocks lists focusing on high growth potential stocks over 5 years; Retail Price is $199/yr. Read our Motley Fool Review. | ||||||
| 11. | Zacks Under $10 | -0.2% | -4% | -4.3 | 263% | January Promotion: $1, then $495/yr |
| Summary: 40-50 stock picks per year based on Zacks' Quant Rating; Retail Price is $495/yr. Read our Zacks Review. | ||||||
| 12. | Rule Breakers | 34% | -5.1% | 69% | 320% | Current Promotion: Save $200 |
| Summary: Rule Breakers is included with the Fool's Epic Service. Get 5 picks/month focusing on disruptive technology and business models; Lifetime average return of 355% vs S&P500's 149% since 2005; Now part of Motley Fool Epic. Read our Motley Fool Epic Review. | ||||||
| Top Ranking Stock Newsletters based on their last 3 years of stock picks covering 2025, 2024, and 2023 performance as compared to S&P500. S&P500's return is based on average return of S&P500 from date each stock pick is released. NOTE: To get these results you must buy equal dollar amounts of each pick on the date the stock pick is released. Investor Business Daily Top 50 based on performance of FFTY ETF. Performance as of December 27, 2025. | ||||||