Are lab-grown diamonds real diamonds?

Yes. Lab-grown diamonds are chemically and optically identical to natural diamonds. The only difference is their origin: lab-grown diamonds are created in controlled environments rather than mined from the earth. Both are graded by the same gemological laboratories (GIA, IGI) using the same criteria.

How much cheaper are lab-grown diamonds?

Lab-grown diamonds are currently 83% cheaper than natural diamonds on average. The average natural diamond lists at ￥1,142,369 JPY compared to ￥198,009 JPY for lab-grown.

Should I buy lab-grown or natural?

It depends on your priorities. Lab-grown diamonds offer significant savings, currently 83% less per carat, while natural diamonds hold their resale value better. If budget is your main concern, lab-grown gives you a larger or higher-quality stone for the same price. If long-term value matters, natural may be the better choice.

[JA] Lab-Grown vs Natural in Japan

ラボグロウンと天然ダイヤモンドの価格をシェイプ・カテゴリー別に比較。 Pricing shown in JPY.

Last updated 16 September 2026 · Japan market view

Lab-grown diamonds are currently 83% cheaper than natural diamonds on average, with natural stones averaging $7,370 per carat compared to $1,277 for lab-grown. The price gap is widest for Marquise diamonds at 86% and narrowest for Princess at 77%.

[JA] Overall Comparison

天然

[JA] Avg. Price￥1,142,369 JPY

総掲載数12,323,959

ラボグロウン

[JA] Avg. Price￥198,009 JPY

総掲載数20,009,090

価格差

ラボグロウンの価格差82.7%

シェイプ別価格差

シェイプ別に、同等の天然石に比べて合成石がどれほど安いか。差の大きい順にソート。

Marquise

86%

Pear

85%

Cushion

85%

Radiant

84%

Heart

84%

Asscher

82%

Emerald

82%

Oval

81%

Round

77%

Princess

77%

Compare Lab vs Natural Lucyに相談

世界100社以上の小売業者の価格を比較。理想のダイヤモンドを最安値で見つけましょう。