Synthetic Diamonds are not Diamonds

HEUKING, represented by Dr. Georg Jacobs and Marc Dümenil, secured a refund of the purchase price for synthetic diamonds in proceedings before the Essen Regional Court, Case No. 12 O 374/25.

Our clients purchased jewelry from an Essen-based jeweler containing 42 stones described as “brilliants.” In reality, these were synthetic, i.e., artificially manufactured stones with a significantly lower market value than natural diamonds, also known as mined diamonds.

The jeweler had not disclosed, either before or during the conclusion of the sales contract, that the stones were artificially manufactured and synthetic. When this came to light, he initially refused to rescind the sales contract and pay damages.

In the ensuing litigation, the Essen Regional Court indicated that fraudulent misrepresentation by the jeweler against our clients was likely:

“[…] in light of this, the Defendant should have disclosed the synthetic origin during the sales negotiations. Since it failed to do so, it appears likely that fraudulent misrepresentation is to be affirmed. […]“

Following this indication, the jeweler refunded the purchase price and paid damages.

This case underscores the importance of transparency and disclosure obligations in the trade of gemstones, jewelry, and other luxury goods. Even though synthetic diamonds are visually nearly indistinguishable from natural mined diamonds, dealers may not make false representations to consumers. Otherwise, in addition to cease-and-desist actions under unfair competition law, they face complete rescission of sales contracts and liability for damages.

Counsel for the Buyer
HEUKING:
Dr. Georg Jacobs, LL.M (Boston University),
Marc Dümenil (both Trademark and Trade Name Law), both Düsseldorf