Gemstone Size Simulator

GemSize is a free online tool for visualizing and comparing gemstones at their actual size. You can compare gems of any shape, color, and carat weight and see how they look on a ring and finger - adjusted to your exact dimensions, right on your screen.

To start, just select the gems, their weight, shape, color, and size (optional), and click compare. You can compare two gems side by side or examine a single gem in more detail.

In order to see actual sizes on your screen, please input your device screen size (diagonal in inches):

Popular comparisons

• 2.7ct Ruby (Pear, Red, 10 x 7) vs. 3ct Ruby (Emerald, Red, 9 x 7)
• 1ct Kyanite (Oval, Blue, 7.77 x 5.18) vs. 1ct Tanzanite (Oval, Blue, 8.07 x 5.38)
• 1.5ct Tourmaline (Round, Light Red, 7.45 x 7.45) vs. 1.5ct Sapphire (Round, Light Blue, 6.84 x 6.84)
• 1ct Aquamarine (Oval, Light Blue, 8 x 6) vs. 1ct Spinel (Oval, Gray, 8 x 6)
• 1.16ct Diamond (Round, White, 6.82 x 6.85) vs. 1.2ct Diamond (Round, White, 6.82 x 6.86)
• 6ct Morganite (Cushion, Light Red, 12 x 10) vs. 3.5ct Sapphire (Cushion, Blue, 8.49 x 8.49)
• 1ct Alexandrite (Round, Bluish Green, 6.14 x 6.14) vs. 1ct Emerald (Emerald, Yellowish Green, 7.28 x 5.39)
• 1ct Sapphire (Baguette, Blue, 6.93 x 4.62) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
• 1ct Topaz (Round, Blue, 6 x 6) vs. 0.5ct Topaz (Round, Blue, 5 x 5)
• 2ct Zircon (Round, Light Orange, 7.16 x 7.16) vs. 2ct Emerald (Emerald, Dark Green, 9.17 x 6.79)
• 1.35ct Spinel (Round, Red, 6.84 x 6.84) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
• 1ct Benitoite (Round, Light Blue, 6.16 x 6.16) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
• 1ct Tanzanite (Round, Blue, 6.37 x 6.37) vs. 1ct Emerald (Round, Green, 6.37 x 6.37)